This is one of your favorite things to do when you're not actually working on music...
Building sampler instruments. :)
I really can't imagine myself w/o the Logic/EXS-24 combo anymore - it's at the very center of my creative process and I can build entire pieces of music using only that. It's always worth it, putting the time into creating custom instruments.
I've recently demo'ed Cubase 7 to see whether or not I intended to upgrade but it seems I'm way passed the point where another DAW could stimulate my creativity.
On a shameful sidenote, I've also recently come to the realization that I often
seem to prefer sampled synths to virtual synth emulations... :/