I love reading these types of posts- makes me feel like the true amateur at fly fishing I am, be it salt water for stripers/blues or fresh water for trout/smallmouths or when I run into them, my favorite carp. 90 percent of my fishing is done in Jersey. As a avoid amateur I will toss in my 2 cents.
I would say 60 feet standing on the beach, dealing with waves, wind, different weight rods, floating or intermediate lines, big bunker flys or poppers is about the best I can do, cast after cast, never mind also dealing with spin guys on my right/left and this past fall standing behind me tossing plugs over the top of my head with me looking back and saying I need to be able to cast backward where you are standing could you move? The fish will be moving to the left or the right so no need to be standing right behind me. I can throw further in backyard, generally 80 foot depending on fly being used, without a lot of effort, but in the real world of fishing off the shore in Jersey 60 is about the best I got, cast after cast- I have managed to hook up with other fly fisherman this year and its been enjoyable fishing with them as they have thoughts and ideas on fishing/casting/flys etc that give us the best opportunity to catch fish but even though they are superior casters, the distance difference is minimal. They do seem to do it with less effort and I know that by this time ever year, my right elbow is barking from the repetitive motion of casting.
As far as freshwater, there is no river in Jersey other then the Delaware where a long 80/90 foot cast is going to get you anything. I think taking the time to move into the correct position, without disturbing the water and keeping casts at the 20-40 range seems to work a whole lot better and if fishing nymphs almost no casting works better.
In the end I spend a lot of time learning the beaches and local salt water rivers I fish- where the sand bars are, how the jetties/groins move current, where in the rivers, hard sand meets soft sand/mud and how that then drops off into deeper water, through all the tide and moon phases, some places just fish better on different tides, incoming/outgoing and some holes hold fish for different portion of tides then others. If i could toss a fly 90 or even 80 feet as easily as I can the 60 feet I would admit that would open up more water to cover/explore. I fish because I enjoy being outside, i enjoy the smell of the ocean, the flow of a river and what nature will surprise me with by being a part of it, being with friends and the enjoyment of a nice fish caught, landed, released and talked about later, being with my sons and debating should we fish here? or there? can we wade the river up to that area? or go downstream and finding new places. All of this is my mental break holiday from real life and the competition of real life and I completely understand others who want to push the limits of their abilities to cast and to learn how to cast for the shear enjoyment of taking on that learning curve and achieving it. I completely respect that.
Its not for me as when I am standing on a beach or a river waving a stick I am looking to be detached for a few hours from being an adult and enjoying just being a kid again without any worries or concerns.