I'm happily swayed by the idea of nostalgia too, however I think the reality is that every single fishery in this country probably looks completely different now to how it looked in (let's say) the mid-70s. How about this, a river wye with no barbel in it? That's right, they were introduced later on.
I can think of many venues from my childhood in the 80s which are utterly different today. Some are sad shadows of what they were... however, some are dramatically improved.
The lesson here - if there is one - is truly, make the most of what you can get right now because in 5, 10 or 15 years it might be completely different. Luckily, I have come across a couple of truly magical fisheries over the years, some are what might be looked at as neglected commercials or club waters, driven past on a daily basis by busy anglers wanting that 100lb net or 25lb specimen. The fact that they might contain roach that average 0.75lb and go much bigger might be of no interest to them. Or that a carefully presented worm or prawn might yield a days net of 20lbs of perch. - still not bothered. So I will gladly make hay while the sun shines and enjoy those treasures. The fact that these pools are lined with ancient trees (which might hamper the wielding of a pole or significant overhead casting) is something i'd see as a desirable feature - but I know it will put many others off.
In the scenario I've described above, what will almost certainly happen in time is one of two things (and I've learnt this through bitter experience!) - either the lake will eventually fall in to such a state of disrepair that the owner will just call time on fishing altogether; or maybe, the lake will change hands and the next owner will make all of the improvements that the angling population is crying out for - rip out the trees and bankside shrubs to make access easier for trollies or barrows (and to end the possibility of one peg being "hot")…. and dramatically change the stocking levels to give all the anglers what they really want, bigger fish, bigger bags of fish, fish fish!!
(I'm sure you can probably tell what I think about these changes being made!)
So get out there, make the most of it, and best of all - enjoy it while you can. Change is inevitable.