I don't mind them because happily is an adverb, not an adjective.
If it was "happy ever after" it would imply their lives were always happy and everything would be perfect. Happily implies they live that way - i.e.: they get through life choosing to focus on things optimistically with the idea they will get through together, even if the economy crashes or Mongols attack Prince Charming's castle or whatever.
The way I see it, we only see 1/4 of 1% of a family's lives even in a sitcom, and the fictional lives of people ina movie even less. Looking at families like the Huxtables or the Bradys, I would say theirs were "happily ever after" stories even though they had their tiffs at times, becasue of how they chose to get through life.
So, I really like romances in some ways, though it has to be the right kind, no raunchy stuff or anything, for instance. I like films like, say, "Sleepless in Seattle" becasue I picture such a couple, like the Bradys, staying together and having the kind of loving life where they care about and respect each other.
I guess that comes from being an optimist, though, in general. And the fact really evil people downright scare me, so I sort of have to look at the world that way, and when i see a situation where things do turn out well, it makes me feel good. Indeed, though I'm a guy, I probably cry at movies like a woman, though I rarely ever see movies anymore becasue I can't stand all the filth they put in some nowadays.