Only once have I used dry yeast (S-05), and as in everything else I do, I researched rehydrating exhaustively and followed what I learned to the best of my ability. It was a bust. Nothing. I ran down to the LHBS and picked up some wet yeast and off it went.
I've never experienced any issues with US-05 - it has always been fool-proof. I have normally just sprinkled a single pack over the foamy head on the wort after aeration and not stirred
to give it time to absorb fluids slowly. Lately I've been rehydrating my dry yeasts (e.g. Belle Saison). It is probably wiser to let the cells gently absorb H20 and build up their cell walls, but I have not experienced any fermentation issues when I have not done so at the 5-gallon batch size for normal gravity beers. I've also seen some "old schoolers" from a nearby club just dump a pack into their very high-gravity IPAs. They seem to do fine. I always keep US-05 on hand in the fridge for any unanticipated brewing needs. It's a work horse for most American style ales. I'm a fan of dry yeast - perhaps I'm just cheap. My last liquid purchase was a Koelsch - liquid is obviously great for specialty varieties like that.