I totally agree with you! Because doing what they do I.e. going on the ride through emergency exits and ride exits, yes it does take out the queue waiting time but sometimes waiting in the queue can be fun because there are things in the queue that entertain people whilst waiting and it builds up excitement. Also just walking around, if your a celebrity you cant just walk around the parks as you will be, as you said, be mobbed
which I feel is unfair on them so I do think it is hard for celebrities to enjoy WDW and the rides ..