I personally wouldn't say that The Smiler's queues have been shorter, as everytime I visited the park last year (mainly weekends, but a few off-peak school days) The Smiler was always on at least 35/45 minutes (and I have rarely seen it under 15 minutes), and then most weekends 80/90 minutes. Other than that the queues are fairly minimal off-peak, with The Smiler, and usually Rita/Spinball Whizzer on the longer wait times, so with that being said you could do the park easily off-peak, and get several re-rides in. But saying that though, during the summer this year I did have to experience several lengthy waits, therefore I wish they'd increase their opening to like 7pm at a minimum and then I'd prefer it at about 8.30/9pm. Like, think off all the possibilities they could do during summer evenings, concerts, DJ's, etc... I'm being too gobby now, so I'll leave you with that!!