[redwall_hp]

Attack on Titan heavily uses CGI for action sequences and dynamic camera movement. It's a fairly common technique that often goes unnoticed, but it's done very frequently in this show due to the crazy ziplining.

https://www.youtube.com/watch?v=L2BynvwE3Do

[the8472]

I believe when people are talking about 3D anime they mostly refer to the characters being done in 3D or it dominating the show in some other way. Props, cars, indoor environments, mecha and so on have often been done in CG for quite some time now. Of course context matters, a mecha fan may care more whether they're CG or handdrawn. If anything AoT is a bad example here because it makes it obvious rather than going unnoticed.