I started tossing spoons for steel last year. To be honest, it was just for a change of pace and to learn something new. Set down the gear rod for the whole season and only stuck to hardware.
I found out a few things:
1) A properly fished spoon is hard to beat
2) The myth about steelhead not liking metal in December/Jan is quite the opposite of the truth
3) You can cover a tonne of water in a day, effectively, if doing it properly
4) The hit from a steelhead on a swung spoon is unbeatable, in fact, I haven't looked back
This year I have been fooling around with the pin a bit as well as chucking metal, and still most days the metal out fishes the roe/prawns/jigs by a wide margin.
A few times sight fishing this year we spent over an hour tossing everything at a pod of fish from roe, prawns, crayfish, worms, pink worms, wool, jigs, literally everything. We even downsized to 6 pnd flouro leaders up to 3 ft long and still not a hit. Threw the spoons through and picked off 7 fish in 8 or so casts, and this was in December and January.
As for your question about it being ineffective on the Vedder. Last year I hit 6 fish in December in 5 trips... and pretty much managed a fish a trip on them. So, yes they work well, just not many people seem to toss them. You also get a lot of looks/comments when you walk into a run with your spinning set up. The one thing I have found on the Vedder, is the fish seem to like the spoon down deep. I even very rarely hit them on the swing (like everywhere else) as opposed to rolling it along the bottom or jigging it.
It can be a tough road to learn. It took my a while to get use to what a proper swing felt like, and how to keep from losing spoons, how to hook up fish, etc. It's a lot different than float fishing as far as hooksets and covering water properly. Also be prepared to loose a bunch of spoons. Most days if I'm hitting fish I'm going to lose at least a spoon or two to the bottom. I'v heard lots of the better metal chuckers say if you're not losing at least 1 spoon a day, you're doing something wrong.
Another quick thing.. I'd stick with spoons until you get good with them. Feeling a swing on a spinner is much more difficult than a spoon, and to be honest I still have yet to hit a steelhead with a spinner even when they go nuts for the spoons. I would recommend R&B spoons in 2/5 size to pretty much cover everything.
I could go on and on really... so I'll stop there. Any other questions you can feel free to post em on this thread and I'll respond, or shoot me a PM.
Cheers,
Dan