We just did this on May 10, and it was one of the best 10 min of the whole trip! It is in INNOVENTIONS WEST, (I think West, and CMs will be able to direct you but there is a sign above it. It was pretty easy to find once we figured out which Innoventions side to go to.)
We had zero line, it was about 5pm, our group walked up, I had two cards and he hardly even looked at them. Super cheerful guy! I said "Do you know who is in there?" He said "Of COURSE I know, but I"m not going to tell you, it's a surprise!" And in we went, and I have to say, I absolutely felt like a KID again! There was Minnie and Pluto, just waiting for us! It was such a delight. Especially considering I had just gotten off of the Magic the day before and even the Minnie, Mickey, Daizy characters had lines that literally wrapped around the atrium. I felt REALLY special, knowing that these characters are literally just waiting for US from 1-7!
And all the photos are great! I saved my PhotoPass card and downloaded some of them this morning. I also got 2 free prints (because we have 2 accounts.) And I was told when I was getting them processed that we could have taken a new photo for free every day that we were at Epcot! Good to know! (I was also told that we get an exclusive lounge on a roof top during Food & Wine fest.) My friends that were with us never got to take their photo even though they had the card, I guess too much hopping (we did base days.)
For me, this was one of my favorite parts of the trip and the family photo is one I'm going to treasure for a long time. (Our family got together from 3 states, WA state, Gulf Coast and KY for our Disney Land & Sea + Sea World trip.) This is one of my favorite souvenirs!
Definitely don't miss the chance to get at least one on your trip! Character lines take SO long, and this is definitely in one of my favorite perks of the card! (Besides paying for half of our cruise, having $175 to use for park tickets, and then $104 to use at Brown Derby Fantasmic- holy moly what an AMAZING dinner!!!!- and then having $26 more in rewards for Ep after we got off the cruise, AND getting 6 months interest free on our On Board expenses and excursions!)
My husband says I'm smiling WAY too much!

This is one I got off of the photo pass this morning:
These were to the 2 prints I got from my vouchers:
I definitely will be keeping my cards moving forward. It is a guaranteed great character interaction in addition to all the perks we got. Still one of my favorites anyway! Who has time to sit in a line?