Yes it would, you would then actually notice all the extruded areas
The only time you wouldn't see the extruded parts is if you're in a shadowed area that's not lit by lights
I don't care whether or not an object uses ambient occlusion, but i will say that it's quite unnecessary, 1) it's more work for the creator as they have to UV map their item properly and be able to make a good looking AO bake, which not everyone knows how to do that (not saying Taboo doesn't know, however) and 2) it adds some extra download time for those who don't have it, more time than just downloading a bunch of tiny solid colored textures, i don't see the majority of the players even caring about having such minor detail that's also causing them slightly longer download times
Blockland's been fine without ambient occlusion this far, i don't see much point in starting now that there are so many items and vehicles out there without AO, the obvious difference from objects with and without AO would just look strange