I find the most joy in using every knife I can attain. Use creates cause for sharpening and polishing. Sharpening and polishing creates want for use. A beautiful cycle.
My pro environments are secluded from the chaos in the kitchens and I enjoy the benefits greatly, because the biggest deterrent to using outstanding tools is the recklessness of passers-by. Namely, security is the biggest benefit and because of this I never hesitate to browse my options daily and select what suits the expected tasks of the shift.
I find that keeping things fresh is a great exercise in understanding and appreciating all aspects of different knives. There are several “favorites,” but I try to keep among my options: knives with unique, if subtle, different characteristics that justify their place in the inventory.
Because I think it’s beneficial to maintaining and developing skills/technique, I like to try as many different versions as practical, so there tend to be several in the “out box,” as preferences continue to change. Thus, knives I tend NOT to use are the ones that aren’t unique or appealing in some particular way, and so these inevitably get passed on or loaned out.