Click the triangle to open this section. Simply uncheck the plugins you don't like. You can also use this tip with iPhoto, iTunes, and probably a load of others I haven't checked yet.
What could be more logical?
[Editor's note: In looking through the list, I didn't see the Ken Burns effect specifically listed, so I'm not sure you could disable it in this manner, but this is still an interesting feature. I'd known about the Languages section of Get Info, but not about the Plug-Ins section.]

