I was at USH last month. The line of jurassic park is definitelynot 5 mins. It was actually 35 mins at the time I rode it.
5 minutes in the middle of a summer day is definitely not normal (even with the high capacity). Jurassic Park tends to always be between 30 and 45 minutes during the summer afternoons these days. Only situation I know of that would create that is if the ride were just coming back up after being closed for a while. It'd be back up to normal in no time, though.
I used to work there and was in management in both Merchandise and then Operations before I left after the opening in 1996.I was part of the opening team for JP so I know how it works. That is why I have a clue about how the ride operates.