My car key has the remote integrated so I have the remote/key, then the remote start fob, house key for my mom and dad's house, key for my luggage lock and key for my bike rack lock (locking the bike to the car).
I have a separate ring that contains keys for MY place, another bike lock key and another luggage lock key. This setup goes back to before I had a garage door opener, seemed silly to shut off the car, get out, open the garage (that was locked so I needed the key) then restart the car to pull in. Also helped that I wanted the car lights on so I could see to unlock the garage door.
For a key-start car, more stuff on the key ring can cause unnecessary wear on the ignition cylinder so I've kept my key ring containing the ignition key as light as I can for as long as I can remember.