5-MeO-DMT
I think 5-MeO-DMT is the most disassociative drug I've ever done. Salvia didn't really phase me, and other psychedelics are just a lot of fun. However, I haven't tried PCP, and I have no plans of doing so either. 5-MeO-DMT was a whole new world for me. As for the 5-MeO lasting only 15 minutes max, that doesn't really matter... during those 15 minutes of Earth time on one particular trip through the void (approx. 14 mg smoked in 2 hits), I spent 3 days in this alternate universe...
I danced with my shaman, swam up (yes, up) waterfalls, drank with the elves, slept on a giant floating lily pad in the middle of the ocean forest (it was a forest growing out of the middle of the ocean), and watched one of the suns set (this planet had 3 suns). At the end of that third day, my shaman told me that this was the end of this journey for now, but he asked me to visit again sometime when I was ready. I got sucked backwards, back through the void, and fell back into my body. Only 14 minutes had passed on my clock in my room. I plan to post a full report of this trip sometime. My favorite explanation of this is that 5-MeO drastically slows your circadian rhythms (your internal body clock).
Most people don't report visuals like that on 5-MeO though. Personally, I've done it over a dozen times, and only got heavy visuals like that twice. That trip was 5-MeO solo. The other time was when I smoked it during a 2C-I trip. I think I'm done with 5-MeO for now. I do miss my shaman though. I have since tried 2C-I with LSD with good results, so throwing in 5-MeO with the 2 might provide a very interesting experience. Hell, why not go all out and throw in some ketamine. If I keep talking, this post is going to turn into the most dissociative combo. Who knows? Different people get different experiences... for me, 5-MeO-DMT is the most dissociative I've done.