A nice warm neo hood and ear plugs make a huge difference if you get your head wet. Ear plugs I also find very useful, even if I have a hood that covers my ears. Cold water in the ear could disorient you very dangerously and quickly plus it is said to cause surfer's/swimmer's/kayaker's ear (bone growth in the ear canal that reduces its diameter and your hearing ability over time).
I paddled with a dry top and a 3mm farmer john suit recently because I had no other option. The water was not cold so that's not the point. The point is that I thought I would feel contstrained and uncomfortable, but I did not. I felt very nice for the 6 hours or so I spent on the river and was glad I had the long legged neo suit on since the water splashing inside my kayak was pretty chilly. With long sleeves neo, I'm not sure how I would feel - never tried it, but I can imagine if the fit at your arm pits is not good you will hurt pretty soon, the rest of the suit is not a big deal, other than gettin sweaty.
With a good dry suit and if you are not paddling all out, you will be pretty much dry at the end of the day as the fabric breathes and vents enough to keep-up with moderate levels of effort. Plus, it is a lot easier to get in and out of my dry suit than from a 2-piece top/bottom and at the end of the day I don't come out of it dripping wet and naked or nearly naked in the cold as I would be from a wet wet suit...
Bent Shaft Canoe Paddles
The Moose Rack
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