I find it really frustrating that you can come up with an idea for a song in your head, but it takes weeks to actually record it.
Wish there was a way to plug your brain straight into the computer so you didn't have to spend hours fiddling around with MIDI notes, editing songs, programming synths, adding effects etc..
I just spent the last three days converting .wav loops into .rex loops & can barely remember the song I started working on.