I was going to say Whistler would suit your criteria (like juneau I have never skiied there, but know the drive from Vancouver is a couple of hours, late season it can be softer on the lower slopes, but the top is still fine, but overall the snow is 'wet' rather than fluffy dry)
We usually ski in the Okanagen at Big White or Silver Star - these involve a second flight from Vancouver or Calgary and then an hours drive (plus supermarket stop!) Ski in/ski out, close mid April, usually lots of snow. Big White is bigger and our preference now children are older.
Another option is Sunshine if you want ski in/out - often open until May/June. Great skiing, but problem is you are stuck up the mountain and I go stir crazy after a few days. If you stay in Banff you have to bus in each day, but also get the option of going to Lake Louise and Mt Norquay. Banff is about an hour from Calgary I think. We sometimes combine Big White and Sunshine to get a longer break if Easter is very late.
Jasper at that time would be a bit slushy in a normal year as it is quite low (and small) Then there are the other places like Revelstoke, but I don't know of people who have been there, or the other smaller ski hills, but don't think you could make a break just staying at one of them, so would need to move about.