It's worth having those drops for when something happens. From my own experiences, I think that rabbits tend to have eye issues more frequently than dogs. I think a major reason is that the eye shape and the way rabbits rub their eyes make it easy to push crusted discharge that has hardened, or other foreign matter, into the eyes and damaging them in the process. The tendency of hay to have small, sharp shards that can be light enough to go airborne doesn't help either, and it's impossible to completely avoid this short of not feeding any hay at all (which would obviously cause even more serious issues than eye injury or irritation). On a good note, corneal abrasions tend to heal rapidly without requiring major action in most cases, and I think rabbits eyes heal even more rapidly than our own. Those drops help reduce irritation to encourage healing, and they can help reduce the frequency of eye rubbing (which obviously can slow healing by doing more damage.) Drops that are thicker are preferable to thin liquids because they last longer (and, at least for people, usually provide much more relief.)
While this is a moral discussion all on its own, those drops (and most human eye drop products for that matter) have been extensively tested on rabbits and have established a low probability of serious adverse reaction.
With that said, I personally avoid products like Clear Eyes or Visine as these eye drops have some pretty significant concerns that have only recently come to light (most of these regard chronic use but still.) Brands like Refresh, Blink, and Systane are IMO preferable despite the premium pricing. The products that are thicker are better for rabbits, and, in the case of extreme eye irritation, some of the gel/ointment products can be very useful as they give the longest duration. In the case of extreme damage, such as a *very* severe corneal abrasion, medicated drops/ointments may be necessary to reduce the itching/irritation and to prevent secondary infection (for example, eye drops with an antibiotic, anti-inflammatory, or both, although I am not sure what particular brands are used with rabbits.)