A GO Bus service that I fondly remember, that no longer exists, is the one that would call solely at: Oriole and Old Cummer, when the trains weren’t in revenue service. I loved using this bus because after 9pm, the driver would let you off at the intermediate TTC stops along Leslie Street.
The current Richmond Hill buses skip everything south of Langstaff (/RHC). I’ve mentioned this in the past, but it would be nice to have these buses stop somewhere around Don Mills Station. (Edit: And possibly the bus loop at Seneca College.)