I (we, my wife is learning to shoot also now) also only have 3 lenses but on two camera's.
One has a Canon 24 - 70mm 2.8L and the other has a Canon 100-400mm 4.5L

We also have an EF 50mm 1.8 Prime, so cheap yet so effective.

In my hands I guess the 100-400 gets more of a work out usually but the 24-70 gets plenty of attention. The 50mm a bit more rarely. I take all sort of shots so the lenses varies.

This weekend I'm shooting an all night Mountain Bike event on the Gold Coast so the 50mm and the 24-70 will feature mostly until the sun is out enough in the closing stages of the race where I might use the 100-400.