afishinado sums it up pretty well.
The river is so diverse, you can't imagine it. If you are looking to nymph only, you'll have to work to do in order to get from one riff to another. If you are fishing dries only, you may not get off a single cast for 6-7 hrs. If you are in a pool and don't see a single bug all day, it's possible to find out at the diner later in the evening that the guys fishing 1/2 mile down river had a blizzard hatch and caught 20+ fish per man.
I prefer to fish dries because of the challenge. If it ain't happening, it ain't happening. I'll nymph or streamer fish. Unless you are out there just for the beauty of nature, why limit yourself? I floated w/ Alpa and EsopusGuy last month. EG = 99.999% nymph fishing, Alpa & me = 95% dry fly fishing. There were 0% hatches so all guys nymphed for 7-8 hrs straight. I think it was painful for Alpa but I had more tangle ups.
When wading up there, it's not uncommon for me to put 75-100 miles on the car in one day. Drive from river to river in search of where the insect activity is happening. Lot's of wasted time, gas and many hours sitting on the banks watching. If you find the bugs, you'll find the most active fish. Without the bugs, you can still catch fish but once you stumble upon a hatch, you'll probably seek them out again in the future. Catch rate 3-5x better, bigger fish and a lot more fun.
When floating, I cover MILES or river. I'm not interested in standing in one section for 2 hrs nymphing or parking and waiting on the bank for 4 hrs hoping to see a hatch. To me, that defeats the purpose of floating. I'm searching for bugs as much as I'm searching for fish. I've found it in the middle of a float, parked and fished for hours. Sure, I rowed my boat for 2 hrs in the dark to get out but I did it with a big grin on my face.
If you aren't well rounded and / or willing to fish dry, wet, streamer.... you're just hurting yourself and really limiting what you'll catch. If you're good with that idea, go with it. Don't expect me to understand or change my way of fishing to accommodate.
Since the sulphur hatch slowed and the water temps rose, the fishing hasn't been very good for me on the river system. Very slow and lots of fish in the 8-11" range. I'm hoping that the warm water temps hasn't done too much damage. Based on the last 2 months, I'm not expecting great fishing for the JAM but you never know.
Lastly, I'm going in September and organized it as a fishing trip. That's why I'm going. I'll have a couple of lagers and play a few hands of cards. I'm not going to be up til all hours of the night or party so that I can't get up and fish. If I want to get hammered and sleep until 1, I can do that at home and save the 3+ hr drive.
As for the 'frog water' term... some call it that when it's very slow and very flat. The derogatory term is used by those who feel they are above fishing it or don’t have the patience / skill to take fish in that type of water. BTW, the “frog water” has the biggest fish in the river. Less current to fight and lots of minnow forage. When there’s a big hatch, they get to the surface, open their mouths and swim upriver. You have to lead them or guess where they are headed next. Frustrating but it can pay big when you get it right. Why haven’t I ever heard a dry fly fisherman complain about riffles or have a term for that type of water? Help me out if I’m wrong.