Yes there are better programs that Poser for animating. Some of the problems I think people are having is. A good example, animating a sequence, and you know of a pose you wnat to incorporate into the next part to finish that animation, and save time, and do your tweeks after you have that sequence.

Often you will see, when adding a pose from your last pose, It looks great. But then and you run your animation. you see the body spins between all those spaces between. That sceams like a night mare. The first time I ran across this a number of years ago. Nothing I tried worked. The sceret is Diable the feet kinematics, Un wind your characture selecting the hips. I had one clip that spun around twice and then ended into the correct spot. I un wound it one complete time and it landed in the correct place. Sometimes the animation with two such poses. What happens is it twirls in the wrong direction. The starting frame with Kinematics off again and select the hips again. Keep that final pose, but spin it the opposit direction from the starting pose to the end pose.  Leaning that had saved me a lot of headaches.