B.mac, your point is well-taken, but I have to disagree. I will say that Volcano is a very poorly-designed coaster. However, Volcano is one of my favorite rides at the park. Those launches roaring beneath the tracks and blasting straight up knock my socks of every time (unless I wore flip-flops that day, in which case I was just astonished. INSERT "BAD PUN" GIF). After blasting out of the mountain, twisting around the top is not only amazing (to me!), but it lends some exceptional views of the area while twisting around up top. I personally feel like the GP in that even though it's not a very good ride, I think it's very fun and really love it just for being fun, regardless. Plus, it lends greatly to the theme and feel of the Congo, especially with Flight of Fear, i305, and Backlot all tearing away at that.
As for the horrible capacity, I agree it really stinks. What I always do is either line up at the rope near Planet Snoopy and hightail it to Volcano as soon as the security guards open the rest of the park. That way, I'm the first one there and can get a few walk-on rides, or I'll show my pass and get in 10 minutes early for some eased free walk-ons onto Volcano. That way, I can turn and laugh around noon as I walk by the poor suckers waiting in a two-hour line for it later on. You gotta get up pretty early to pull one over on... uh, Volcano!
Like I said, it's not a great ride on its own, but it's really enjoyable in my opinion, and even though its popularity can't be fairly determined based on the long lines, almost everyone I've talked to says it's either their first or second (behind Intimidator) favorite ride at the park. Even Pat Jones said in an interview that it's her favorite ride. No, it's not well-designed, but it's fun. And that's what matters.