I haven't used AfterEffects. I know Adobe Premiere (video editting software)
has a motion capture feature. You hook a video camera up to the computer and
preview the image on screen, then hit the space bar everytime you want to
capture a single image. Then its just a matter or rendering the movie, which
takes a minute, so you can preview what it looks like. This is the fastest,
least technology-intensive way I know of doing it.
Director works as well, but you need to scan each image individually on a
flatbed. If you do this, number your images 01, 02, 03.... or if you have
alot of drawings, 001, 002, 003... that way you can import an entire folder
of images an they will appear in sequence in Director's cast. Then you can
select the entire cast and hold down the option or alt when you drag into the
score. this will speed up the amount of time you have to interact with the
program. The scanning of the individual images will take the most time.
both Premiere and Director files can be outputted to videotape.
It seems this topic came up a couple months ago and someone recommended an
animation kit. I'm sure the message is in the archives.