I've encountered quite a few in my home state of Connecticut. There are two at Hop Meadow CC (my home course) that probably drop about 70-75'. 9 is 228 from the tips, with a pond about 15 yards short o the green, and 16 is about 195 from the tips, with a smallish reen and bunkers left, right, and long. The third hole, a par three of about 150 yards, rises about 30-40'. There's one hole at a nine hole private club by the name of Lake Waramaug that drops 50', and is only 140 yards.
I really like par threes that drop or rise a significant amount. They challenge the players powers of estimation, and they place a premium of the player's trust in those abilities. A solid shot on one such hole is absolutely exhilirating (at least for me, anyway).