Yes and I don't really find it hard work at all, most of it is fun and relaxing.
I presume you work? How old are they?
Some kids are just easy good company (these are the same kids who take crack when they turn 16......joke!)
I also find my time with my kids to be largely fun and relaxing because it is the fun time (with occasional bouts of frustration as outlined, they are almost 4 and 5) but for my wife I think it is tough. In some respects I think it is easier for people who have to work and use nurseries etc.