I learned to fly at Oxford, mountain flying was not a real consideration and waves were only briefly mentioned in Met.
When I came to Canada and started flying again I was shocked to find I was below the tops of the mountains, very strange sensation for us flatlanders. Then people started mentioning mountain flying courses etc. Several accidents around here in the last seven or eight years attributed vaguely (not usually much evidence after the event) to wave action.
Getting transition training in my amphibian from a local sightseeing pilot we were flying thirty or forty feet above hill top lakes at pretty well the aircraft`s ceiling and encountered turbulence as we flew back over the valleys (Slow down, slow down!) I fly nice days, low winds only, with a relatively low climb cabability I have already seen 400ft per min updraft on final and do not want to find its evil twin.
There are several people doing mountain flying instruction in BC. I am planning on getting some before I get more adventurous.