I'm with Bentrods (Rod) on this -
First - I have fished rivers where Kayakers or rafters have gone through, and this has happened on more than one occasion, and I have caught fish shortly after they went through. I really don't buy it that river craft affect the fish that much. Fish that inhabit rivers are used to debris coming down river and that is what oar powered boats will look like to them. Having said that I do try to extend the courtesy to other anglers when float through. If I can, I pull my oars out of the water and try to float through the water like a log if possible. If the river isn't very wide I will pull the boat over and go behind wading anglers if possible, or float through on the far side away from where they are fishing. If there are hazards present then I focus on avoiding the hazards first obviously and that takes precedence over anything.
I've grown up around rivers all my life. I've fished them most of my life. I have snorkel counted rivers for Steelhead several times back when I worked at a hatchery and was part of the recovery programs. I have tried to do some stillwater (lake/ocean) fishing but I always come back to and gravitate towards rivers - they honestly flow through my soul! When I bought my pontoon boat 2 years ago and started getting out and drifting rivers I really realized what I have been missing all these years - I really wished I started doing this years ago! There is not a better way I can think of to truly experience a river than to be on it floating down it. It greatly heightens and compliments the overall fishing experience. I slowly worked my way up to class 3 rivers and hitting some whitewater (with the right precautions) is downright fun! It really adds some extra accomplishment to your day if the fish aren't cooperating!
Floating rivers is very advantageous for a few reasons from a fishing point of view, even on rivers that are fairly accessible. A river like the Chilliwack can be accessed primary on foot as we all agree. I would say about 95% of it is accessible on foot. Of that 95% I would say about 20+% of it requires at least some bushwhacking and time on a trail or so to get to . When you drift a river, while there are shuttle and other logistics preparations plus getting your boat ready, etc. you really can more fluidly cover water rand access more out of the way shore angler bushwhacking type spots more easily. I have also found fishing spots I never knew of. You can also more easily access the other side if the river which is advantageous in a lot of situations - remember the Chilliwack is one of the more difficult rivers to wade across at most levels so this helps. Overall floating in a boat really lets you cherry pick the water you want to fish which is advantageous and also shortens the time between the spots you want to fish.
At the end of the day having done a river drift you will find you REALLY do sink in your seat a bit more. Your stress levels have come way down. And I figured out why: I was watching a rafting video and the raft guide nailed it as to why drifting rivers reduces stress. It is because you are living in the moment. When you are on the oars you are only focused on what is in front of you. Everything is 5 seconds ahead and 2 seconds behind you. There is nothing in your mind but this. Subsequently all the things that piss you off, or that worry you, are gone for the time you are floating down the river. When you park your boat at the end of the day you then begin reflecting on the enjoyment you had. Perhaps watching some video of the drift, or looking at pictures of fish on the camera. And you feel relaxed! As long as you don't get into a life threatening situation and take the right precautions, river drifting is a highly enjoyable activity.
If you are going to throw stones without having drifted a couple rivers I encourage you to drift first and get back to us. I'm sure your opinion will change. I do agree though - I won't go down the Chilliwack during Salmon season, only during the early to mid Summer or Steelhead season when pressure isn't as high.
Also, I have a youtube channel with some video I've taken from some rivers I've drifted over the past year or so - have a look!:
https://www.youtube.com/channel/UCc26no1tJllWgUu6xlSw9xA