They allow this in a provincial park?
Probably not this year because of COVID, but normally yes -- think Tuesdays and Fridays were Robson heli days, from Valemount. There is helipad ~2km past Berg Lake, near Robson Pass. One can also heli to Mt. Assinboine, which is BC Park as well.
Re touristy areas, it's always a debate. I went 3 times & could tell you stories you'd not believe. But it is magnificent & scenery compensates for crowds. Once you are in, like most other places, you only need to get off main trails & you can have it to yourself. That pic was taken from one of such places.