the fishing pressure, imo, is lighter than the 70s. i can remember when large flotillas could be seen at mosquito lake in ohio and pymy. hundreds of boats, akin to the perch pack, drifting and trolling over eyes.
i may be wrong but i think the advent of modern electronics has really hit the fish populations hard. back in the day, the only electronics were in the shape of the little green box. we all carried maps with Xs and notes all over it. we knew areas like the witches cap, the onion field, the red barn, etc and info was passed, not by cell phone, but by land phone or word of mouth.
though i don't fly fish much, i think that is why i appreciate those guys so much. they know their terrain like we know our back yard. no electronics involved. if i ever get another boat, i'm not sure if i will have a fish finder aboard. at least not in the beginning. i'll rely on memory......or what is left of it.....lol