There is a limit to how overgrown and small you can go

Believe me ive tried some really tight spots, which even with a 5ft 6" rod have been hard work. The problem with a lot of very small streams is the amount of bends, which although good holding lies for Trout make a backcast imposible. So roll casts etc are the only way.
If you can wade, take a pair of secateurs with you in your pocket and do some pruning as you go along whilst fishing. It will pay off on your next visit.
I have found a couple of visits with a bit of trimming can make the world of difference, just leave plenty of cover for the fish.
Great feeling when you find a new bit of water, enjoy yourself
Steve