I found the lushest growth at more southern and northern sites; down south Sweet Dreams and I think Red Beryl; up north Karpata gets a lot of notice. If you head up to Karpata, be aware you commit to a one way road, so before you get there, stop & use a tank to dive Tolo, which is a good all-around dive site.
Mainstream west coast Bonaire diving tends to be warm, minimal current (it can happen), high viz. (maybe 75-100 feet?), sloping wall diving. Entry/Exit often over/through iron shore, and you can't see the bottom well in surge so step carefully and use fairly thick-soled boots. Brain corals, sponges, gorgonians, a good range of growth I think.
Life-wise, a lot of smaller stuff; trumpet fish, smooth trunk fish, honeycomb cowfish, schools of French grunts, small groups of school masters, solitary blue-striped grunts, some black durgon, black-bar soldier fish, yellow snapper, yellow-striped goat fish, a school of blue chromis...that's the sort of thing I might see on a typical dive. While people say not much big stuff, you may see tarpon (especially on night dives), green moray eels, cubera snapper, barracuda, green or hawksbill sea turtles and occasionally tiger groups (about the only large grouper I see there, and they were skittish) and eagle or southern (I think) stingrays.
What I miss vs. other destinations are other large grouper (e.g.: black, yellow-fin, Nassau) and sharks.
Richard.
P.S.: Yeah, Salt Pier is also a distinctive site.