Here are a few with varying degrees of famousness -
18th at Dartmouth, Devon
12th at Okehampton, Devon,
15th at Kington, Herefordshire
16th at Carne, Mayo
Isn't there a famous one at Cullen, in NE Scotland? The 7th maybe? (Not really sure as haven't been there. Excellent soup fish though, "Cullen Skink").
A couple of good 'uns, although maybe not quite sufficiently droppy -
8th at Royal Aberdeen
8th at Royal Troon
17th at Enniscrone
A couple of drop-shot par-4's that are driveable -
10th at Riviera?
10th at Cruden Bay - surprisingly yes, I've seen it driven from the top-tee with my own eyes, and using a wooden headed, steel shafted driver too!
18th at Kington
18th at Llandridnod Wells
And to add variety a drop-shot par-4 where the second shot is a mega-drop -
8th at Royal Dornoch
All the best