I used to work at Alton Towers, really enjoyed my time there and I do miss working there sometimes, but I do wish I had of worked on a thrill ride.
Guests can be annoying and so can the people you work with, but overall its an enjoyable job.
It does get repeative, especially if your on the same ride for 5 days in a row, like I was last year during the summer, I was on RMT platform 5 days in a row and it got very boring, but if you get trained up on a few rides and get moved around a bit, then its fine, its just when you are stuck on the same ride for a full week without a change that it can get boring.
To answer the question of the topic, I wouldnt mind workin as a ride op/host again if I ever get the chance.