I don't. But for most women, I think it would be better.
Many women, unfortunately, are more concerned with meeting their own needs than meeting those of their children. If your children live with you, you need to put them first.
However, as your kids go off to school, etc., you may find yourself with time to spare. If you found someone that was a good person and had a similar attitude and could take being a back seat to your kids (not a doormat), then, if you loved each other and the kids were okay with it, etc., I would say it's okay to get remarried.
But otherwise, there will be endless conflict in the home and your children don't deserve that.
Of course, the flip side is: what if the kids live with mom, should dad date? Get remarried? Or should he too remain single? I think the same rules should apply to dad as mom, regardless of where the kids are living, since they will be exposed to both parents and their lives.
The only major drawback for a woman to wait is...it gets that much harder to find someone as a woman gets older. If she waits until her kids are grown and out of the house, she might be 50 before she can get remarried. And good luck with that.
So...it's a case-by-case sort of thing, IMO. Inshallah I'll never have to figure this all out for myself.