Man... Y'all hating on benzos... Take the time to drop a quick acting one (Xanax, Etiz, Clonaz(epam/olam), etc.) and lie down in your bed and just have good tunes on, it'll be the best adventure you'll never remember (Lol, got that from somewhere else, it was a picture of a walrus with text around it saying "AMBIEN WALRUS, Come with me on an adventure that you'll never remember").
Besides that, I'd have to say DPH is definitely boring if you're talking boring on a usefulness/fun scale, like, the shit is useful if you're too happy generally and want to have a fucked-up and mentally-scarring trip, if you can even CALL it that.
If you're talking generally boring to use, I'd say any GABAb agonist, Baclofen, phenibut, GHB, GBL, etc. Just doesn't seem like fun to me.