The only drawing that I found a pain was...well, Pain. Mainly because when I got it from the Raldo/Granaldo boss fight Zell had such bad magic stats he could only draw about one or two at a time.

I found junctioning quite enjoyable, especially working out what stats to boost with what magic. My only reservation has been articulated already several times (casting junctioned magic lowers that stat).

I got around having to cast offensive magic by summoning a lot early on, and junctioning to my characters attacks to pummel foes later on.