The consensus seems to be that the 1880 is basically the same tractor as the 2380, other than slightly smaller wheels and width - which isn't material in most cases - and the lower HP.
For most applications the BX80 is traction limited - so you run out of traction well before you run out of power. And the loader is the same and lifts the same as the 2380 - again it's not a power limitation but a pump limitation.
The situations where the HP matters relate to anything that drives from the PTO, so:
- 60 inch mower can be a problem (I think they don't offer it standard), the 54 should be fine
- wood chippers, snow blowers etc may be down on power
- depending on size of tiller, you might have to go a bit slower
For most people it seems to go just fine, and in general if you've never had 23HP you'll be happy with 18. Everything else is the same. But if you've had 23 you might find it a step down.
Resale on the 2380 is quite a bit better apparently.