Is it ever challenging to find parking in East Fishkill?

I'll say no. Most places people go in East Fishkill have parking lots and I've never had a particularly challenging time finding a spot there, so to me it's always been doable. I don't know of anywhere in town (on the main roads, anyway) where there's street parking, so that would certainly be difficult for obvious reasons, but if you're even just doing something as simple as visiting someone's home in East Fishkill, chances are they have a driveway so that problem is solved as well.