For those of you with the Premier Visa, can I earn 2% back at Disney even though I use my magic band to charge the purchase (presuming my MB is linked to my disney visa)? I think I have read that, to get the 10% discount on merch, you have to present the actual card. But is that not the case for earning points?
2% applies to any and all charges to the card, so using a Magic Band has no bearing on that.
You mean 2% at a disney resort or park, right?
The Disney Premier Visa gives you 2% back on ALL purchases, no matter what. Gas. Groceries. Socks. 
The 2% comes back to you on a Disney Gift card is all.