If you are worried about weight and size, there is an 11" MacBook Air which is at least a proper computer. It has a real keyboard, so you can work on it efficiently. It has decent I/O. A fast processor and plenty of RAM. And it will run full music applications instead of cut-down 'apps', and it isn't restricted to 64GB of storage. And you don't have to go through a lot of nonsense with iTunes in order to get files onto it for reading.
On the other hand, if you want to be always connected (blah blah blah), then a smartphone lives in your pocket, and the iPad doesn't.
If you want to play Angry Birds and download apps that make the screen look broken when you tap it (ha ha ha), then by all means get an iPad. If you want to manage other people while traveling, it has a use too. On the other hand, if you want to generate anything creative or that can't be expressed in a few sentences, it's the wrong tool for the job. And if you want it as a control surface, there are plenty of physical control surfaces that do a more direct job for the money.
IMHO, iPads are for internet surfing, reading email, and playing kids' games. I have one at work (am in a software company so have to try these things ...), and that's where it stays. A solution in search of a problem.
[Mind you, I think Facebook is a waste of time as well: a whole industry built around pretending to be interested in other people's holiday snaps. So maybe it's just me.]
Instant gratification is actually pretty good. It's fast as well.