Is it enjoyable? I guess that depends on your outlook on life.
I enjoy learning new things, so I thoroughly enjoyed the ground school.
I also enjoy flying, so I loved the flight training.
At the end of the day it's all time invested in reaching out towards your dreams. (If not then why the hell are you doing it?)
Think of it that way, that every minute, every hour you spend studying moves you closer to your dream, then it's not so hard to stomach.
So what if most of it isn't particularly relevant? It's relevant in as much as if you don't learn it you can't hold a licence!
Go to it, enjoy the hard work, enjoy the hard play and move that step closer to your dream!