and

> It gives an ... experience which may be enjoyable or horrible

Doesn't the second claim answer the first? You just said a trip can be enjoyable, at least some of the time.

To get into specifics, I've done LSD a few times, but never a big dose. Sometimes I've had manageable anxiety on the come-up, and often I've experienced an amazing appreciation of music that made the come-up anxiety a small price to pay. And by "amazing" I mean the difference between looking at an ice cream cone and eating the ice cream cone.