We just got back Sat. from our trip. We exchanged our vouchers at guest relations near Ghirardelli at downtown Disney with no problem We were in and out in a few minutes.
We stayed on property. Actually did a split stay. I wasn't sure if we truly needed the hard copy ticket or not because we did have magic bands, but I asked for my tickets. Just didn't want to chance a glitch or something. I felt better knowing I had the tickets. Also, I bought tickets for future use too and those as of now aren't linked to MDE account.
For the poster asking about DTD parking, it does her very crowded there and you have to be patient with trying to park. But overall IMO it's not diff from a shopping mall. And the line at Guest Services wasn't long at all and that was on Friday March 14th.