If you don't mind me saying so I think you are just making accuses. If there isn't enough ground cover for sledding/snow angels, then their shouldn't be a large amount of cover on the swing and slides. Thus playing on them shouldn't be an issue providing the child is wearing the proper "snow" gear to keep them dry and warm. It doesn't take much to brush off the snow to use the swing and sometimes have a little snow on the slide make it a little bit more fun!
With that said we don't go "outside" as often as we should or the kids would like, because I THINK it's a little to bit cold, wet, snowy, etc. Am I totally proud of that-No I'm not! However it's the way I am, and I think by nature most adults are. We, as adults, don't want to sit in snow, play when it's muddy, but in reality our kids don't care...they are for the most part just happy to be playing and will play for hours if they are dress for the weather. I know that if I dressed myself for the weather I would stay out longer myself.
If you are looking for more "fun" for you outside you may want to look into geocaching. You do need a GPS device to play. As long as you have one of them it's free. You just go to the website...sign up for an account (free) and find caches near you that you kind find. We just started to do that ourselves last month and my kids have a blast even though the only caches we have chosen right now are along bike paths. Making it "easier" for me. www.geocaching.com/