We didn't get the vacuum and the fact is, you don't have one now, so you're not going to miss it. If you had it, sure you would use it, but your chance of remorse is low if you don't get it.
We had an older Caravan before the Pacifica that didn't have the tilting seats, so we're used to going through the middle. The tilt seems like a cramped way to get back there when you have a toddler seat installed, and you can't use the tilt at all when you move up to a big girl car seat that uses the seatbelt to attach rather than LATCH... So even if you love it with an infant car seat base, the utility will go down hill fast as the kids grow. Probably more important if you get an 8 passenger. We have a 7...
And this is not universal, but we really only carry emergency type stuff in the stow and go area. It's awkward to get to, especially with all weather floor mats and toys laying around.
With all of that said, we were never shopping for a Limited and my wife absolutely had to have stow and go. We have a TL+ with safety tec and hands free doors.