I'm often inclined to feel lethargic about the idea of taking drugs in general, whilst trippin'. It's such a complex experience that I feel can not be "longed for" the way I do when I'm sober. It encompasses everything in such a way that I want to take it for what it is. I usually have thoughts about treating psychedelics (or rather, my own mind) with more respect. I'll still go around wishing I was tripped every now and then, though.
Only a couple of times have I said to myself "NO, I DON'T WANT THIS", usually it's more along the lines of "Ok, so what? Sobriety can be nice too". Last time, I said "I'll have one hell of a break after this". All out of respect, and not disappointment, with the experience.