Everything said so far is true. But here's some additional bits that haven't been mentioned:
* It was mentioned that in Grind you are often fighting more than one monster at a time. This has some side effects: Spells that target multiple monsters can be extremely useful (unlike in the Dungeon where you almost always have only one target). This also means that things like the Gloves of the Cabal bonus (extra monster target for scrolls) can come in handy.
* Also, having multiple different monsters to face at the same time can mean they will sometimes have different weaknesses that a smart party will exploit. Like: "oh that monster is immune to magic, have the fighters beat on it while the mages take out a different monster"
* Generally, you're facing multiple monsters on multiple combat boards, with multiple DMs. So even though you're fighting more monsters, and tougher monsters, the combats can go more quickly (or at least feel like they do). You also have more physical space to move around so you aren't all crowded around a single board for an hour.
* Skill checks are automatic successes. This means your spells are always doing the best damage they can, and combat doesn't have to slow down for the memorization checks. This also means that your Bard will automatically succeed on any monster lore checks, which they should always do to see what they know about the creatures you face! (It may just save you).
* I think it was mentioned that creativity gets rewarded. Some examples: using a turkey leg to distract a blink dog, cutting the head off a medusa and tossing it at another monster to turn it to stone, making some torches out of club + rope + oil + flint & steel (or something like that).
* Corner-case tokens see a lot more use. For several years, I've tended to wear Lenses of Clear Sight in Grind (when not playing a healer). Those have saved me multiple times from the tricks the head Grind DM likes to throw at us. If there is a corner-case common or uncommon, there is a good chance it will have a chance to be useful during Grind.
Like Matt, I too have a Grind that I could use some more players for at
3pm on Friday
. We're probably doing Normal at this point.