You do see some, yes, but (as Magnatom also says) from what I've seen, they are certainly a minority.
That is just on the road though.
When I used to cycle to/from College years ago on 'The Tank', there were always quite a few* using the 'feeder' Cycle track to/from Speirs Warf out onto the main track through Anniesland etc.
The cycle track is generally perceived to be safer you see, despite how snobby people on here are about them.
* - Not massive numbers, but certainly more than on the road.