[Wheatley can't actually attest to that, because the only place he's ever been is Aperture. Is it true that all science labs look the same? He's kind of skeptical--because how many of them are run by omnipotent central AI systems?]

Okay, doubt it, but at least you've got some frame of reference.

[Maybe he's uncomfortable with the prospect of more places like Aperture.]

Lots of things. Looked after humans for a while, proctored some tests, as you--as you've seen. On your phone.