After being a heavy Excel user for a few years, I was away from using Excel while this change took place. It's been a long time, but as I recall it, when I then sat down to do something more intensive in Excel, I found a bunch of "muscle memory" actions failing; they'd also changed a number of shortcut key combinations!

Serious Excel users could work the keyboard like an experienced Vi/m user. For example, when extensive manual data entry, editing, cleanup was necessary.

A curse on those responsible for these interface changes.

Serious Excel users, for one, bitched for good reason.