The value’s already displayed in the info line in Cubase, but it’s much more convenient to have it near the event you’re editing.
The ability to create two points then drag the line up or down is much more streamlined than in Cubase — the latter requires one of two approaches: either create two pairs of points to do that (but then, when you drag, it automatically creates a ramp before and after; or select Range tool, select range, cntrl+x to split range, select the Object Selector tool, then drag the clip envelope).
FWIW, I set up a macro to speed the last process up — just the split range command, followed by selecting the Object Selector. So it’s 2 for range tool, drag to select, hit a key to run macro, drag volume — four actions in all, which is one more than with PT. But it could be slicker still, and would be great to be able to do this with automation instead of edits.