I enjoyed using a small technique of selecting an object I know was in a specific coordinate, hitting F to zoom on it, dragging a prefab to the Scene window, notching it down (via ctrl + gizmo drag) half the size and would be right where it should be. Is there a way to imitate this or another way to achieve the same effect?
Bump.
AFAIK the only Scene View function that was removed in 3.0 was the ability to select a Gizmo Axis and middle-mouse-drag to still change that value (something I dearly miss). Everything else should be the same, plus some added functionality such as vertex snapping.
I’m unclear what you mean by “…notching it down (via ctrl + gizmo drag) half the size and would be right where it should be.” What do you mean by half the size? Holding down control will make things snap in increments. Perhaps you had some values set up in the snap settings that were wiped when you moved to 3.0?
Yeah, I’m not sure what I was talking about when I said size. I should have said object. For example, if you’re zoomed in (via F key) on a 1x1x1 cube and your drag in a prefab that is a 1x1x1 cube, you used to have half the cube you dragged clipping half the cube that was already there. Since my snap settings were on .5 on moving stuff, if I would moved the prefab down 1 click (via Ctrl) it would be perfectly in align with the first cube. That’s the feature I can’t find anymore.
snapping was seriously extended, you still have the old grid snapping (new hotkey there I think) but now additionally have snap to surface if you press ctrl and drag the center of the object (the yellow box around center of gizmo) for example.
the difference in u3 vs u2 is where newly dragged in stuff is created if I recall right. its no longer at fictive point between camera and hell 
So, lets say I wanted to bring my 1x1x1 cube directly inside my 1x1x1 cube that’s already in my scene. How do I do that without plugging in coordinates? If I do the procedure I used to do, it tries to place it beside it or next to objects I direct the prefab to with my mouse.
Shameless bump.
So, apparently my question cannot be answered or the feature is removed/moved to a mysterious place.