Yes. All of us do
You can most likely find me for example playing 8.0 - 10.3 jets, mix of props, or whatever tree im currently working on. For the moment, thats Chinese tanks, Swedish Tanks and then a mix of all the Naval trees. Try to also get a couple of games of Helicopter EC in each week too.
All of us have our own preferences on certain types. Some prefer Air, Gorund or Naval whilst others prefer a mix of all like me.