I was a longtime non-user of the whip myself, and without using it, it's tough to play well past Prince. Others have explained the benefits here better than I could - but I will say, the results of embracing this civic properly let you expand much faster and earlier in the game. (which isn't really needed at lower difficulty levels since the AI is slower there.)
By embracing the basics of whipping and chopping early to maximize early cities, plus building your cities where special food tiles are in the first ring, you'll be able to play at Monarch.
I'm working on my first Emperor win myself, but focusing heavily on the first 150 turns, so I haven't played out a game to completion at this difficulty yet.