I always hated using the radios, purely and simply because I was paranoid about getting the terminology wrong and making a fool of myself. But after a while, like everything, you get used to it. I'm having to now, as I work towards re-qualifying after seven years of being ground-bound. The other thing I used to hate was landing on a grass airfield at night, which I had to do for the FAA PPL. Especially when my instructor flicked the landing light off!