Following up what Diverrex posted, I can see where a lot of Bonaire dives basically look repetitive; walk in, get about waist deep, put on your fins, swim out several yards, dive in the 30 to 80 foot range browsing over the roughly 45 degree sloping reef, look at the hard corals, gorgonians and sea fans, watch the mostly fairly small fish (lots of French grunts!), and such.
But there's variety to be found. A site called The Cliff has a pretty straight up wall that's visually different. If you WANT some current for some reason, it's my understanding sites at the southern end have more of that - haven't sought it out myself. The Hilma Hooker is the main wreck dive, but there are smaller ones - I like the Bakanal and Our Confidence. The giant stride off Oil Slick Leap is always fun. And of course a night dive is, to some extent, a 'different world.' Cruising along the shallows can show you things; along the shallows at the end of dives at Oil Slick I've seen a huge porcupine fish and rainbow parrotfish ( way larger than the other parrotfish I've seen).
Boat diving at other sites can get repetitive, too, if you do enough of it. Bonaire lends itself to getting a lot of dives in over a few days, so people probably notice the pattern.
Richard.