I always cringe at people who put a lot of keys and trinkets together resulting a heavy load on the ignition key while driving. In the past, I have seen cases where the key just came out of the tumbler but didn't shut off ignition.
I separate my other keys (house, garage) from car keys. The key for one car has only the remote fob for that car attached to it; no medallion, no pendant, no photo holder, no flash drive, no keycard, no ID card, no nothing else. House & garage keys are on a separate chain.