I use to do a lot of pan/zoom editing with Sony Vegas Pro.
Now that I read that Sony plans to discontinue Vegas (they said it will remain supported but there will never be a new version again), I am checking other softwares, so far I have tested those but I would like to hear recommandations.
(I am also making heavy use of "Velocity envelope" in Vegas, I have not tested it in other softwares yet but I'm interested in feedback about similar or alternative features through different softwares. Maybe I should make it a different question.)

 - **Sony Vegas**: Maybe it's because I used it for more than 10 years now but I think its pan/zoom tool is extremely flexible, and you can
   set transition speed/acceleration on keyframes.
 - **Adobe Premiere Pro**: In their pan/zoom tools, it is possible (and seems to happen quite a lot if you do a lot of pan) to lose the corner
   outside of the interface. I don't find it intuitive at all. Maybe
   Premiere users are used to edit numbers rather than to manipulate the
   visual tool?
 - **Adobe After Effects**: Looks like the best alternative so far as the tool's corners remain visible even when they are "behind" the
   interace. Though it is very close to that of Premiere, I found this one more intuitive. From a tutorial I watched this software's tool actually looks more precise than that of Vegas, but quite more complex to manipulate and obtain similar results.
 - **Corel VideoStudio X8**: I am quite lost here and the interface gives me the feeling of a toy.