Well, in a way I've had non-stop cabin fever since my 2nd child was born, which put an end to backpacking for a while. We made it work with one baby, but can't figure out how to carry two kids, and all the gear. Dayhikes are significantly easier/shorter than our pre-parenting days as well. I miss big mile days above treeline, and multiple day backpacking trips.
On the other hand, we do find ways to get out almost year round. We base camp and hike summer and fall, and cross country skiing is a fantastic replacement for hiking in the winter. Our bike trailer/jogging stroller also has a conversion kit for skis with a harness, so we can pull the kids behind us. It is my favorite toy. It quite literally saves my sanity year round. We sometimes stay in a forest service rental cabin or yurt since snow camping with little ones is pretty challenging. Around here, spring is tricky. There is a period when the snow is too sloppy for skiing or snowshoeing, but also too deep and unstable for good hiking. This year, that season has been especially long. We try to schedule a trip south (Moab or Zion usually) sometime in the early spring to get through the worst of the cabin fever season.