At RRSP all the fly fishing is from the bank. (except the C&R zone) All the fishing is from the bank.
Generally speaking, if there is room the spin cast from the bank I can fly fish from the bank. Tippets (end piece of leader) are commonly 3# test and fly lines are ~30# test, I don't know what you call heavy line.
It should take between 6 and 14 minutes to learn basic fly fishing and a simple roll cast, but, you have to stay active all the time while fishing; fly fishing requires full time participation, unlike casting a bait and passively waiting for a hook up.
Is it worth it? Probably not. If you learn fly fishing, you will then want a better rod and a bigger reel and hundreds of new flies and then you will want to tie your own and one addiction leads to another.