I think the smallie fishing is decent the whole way from Callicoon to Trenton. The size of the smallies is up and the pressure is down IMHO. I grew up on the Delaware and have been fishing it for 50+ years. Everybody used to fish and every good spot was hammered when I was a kid Now some spots are crowded, but just as many aren't fished as much as they used to be. Modern fishermen seem to concentrate at the more popular/famous spots and don't exploit the harder to reach, lesser known spots. Explore a little and you will find peace and good fishing.
The smallies are moderately consistent, but will turn off. Often they turn off about noon and sometimes I can't figure why. Most years the shadling run will turn on the fish and fishing behind the pods is first rate, but some years there are too many shadlings and the predators don't concentrate and in poor years there are no shadling schools to key in on. Water levels have been crazy the last decade as well. With consistent water levels and weather I can dial in a pattern; when the levels change all the time it is often hard to find the fish. Hey, it is still fishing and not catching.
I know this is a fly site, but smallies go crazy for 4" Senkos.
I know a few musky guys and IMHO it is a very specialized game. Not many are caught incidentally. The guys that target them spend a lot of time on the water and locate a number of fish. Then they routinely fish spot after spot. Some days you hit it right, most of the time you don't. One example is the Coppermine Beach which is loaded with shad fisherman from March through May. A 4 ft musky patrols the beach all the time right in front of dozens of fishermen. I have seen him hooked (and broke off) once, although many people try. Always cool to spot him though.
For trout, IMHO the guiding section has shrunk. Used to have cold water to Calicoon, which spread out the boats, especially since the advantage of a boat over wading increases as you head downstream. Now it seems most of the action is on the West Branch with the main stem mostly an early season option. In general, fly fishing for trout seems to be getting more and more concentrated at famous streams and Special Regs areas. Leaves plenty of unpressured fish for those who go off the beaten path. But the popular spots sure get mobbed.