If you just want to edit videos and apply scene transitions and medium level effects, then you need a video editing program such as Adobe Premiere Elements or the more expensive Adobe Premiere Pro. After Effects is a special effects program where you can create all kinds of effects including blue and greenscreen, wire removal, there's a particle generator for making everything from rain to smoke to expolosions and matte and mask creation, high end stuff to say the least... so it's really up to yourself as to what you want to achieve.
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Better than a poke in the eye with a pointy stick any day...
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