Revert ALT+Scroll to zoom into the cursor selection
In the past, After Effects would zoom into the position of your cursor when you hold ALT and scroll on your mouse. This is still true until you have a 3D Layer, at which point ALT+Scroll turns into a camera dolly. I never have wanted to dolly in with a camera when ALT+Scrolling and I don't know why this was ever changed. There should either be an option to turn this off, or this should just be turned off.
The new behavior in After Effects 17.5 where holding the Option (Mac) or Alt (Windows) key can be disabled in the new Preferences > 3D dialog.
Disable the “Activate Option/Alt – Left / Middle / Right mouse click for camera navigation” option to return the Option/Alt + scroll wheel behavior to zooming the composition when a 3D layer is present.