Posting to follow. We're booked at Ayres Anaheim which is basically between Angel Stadium and Arrowhead Pond (ok ok fine...Honda Center). Line 15 is the one attached to the hotel. Still debating on whether we will use the bus service or just pay for parking as I'll have a car.
I took line 15 to the ARTIC - Anaheim train station. Take the bus, its way way easier than taking the car. The ART bus stops are right beside the bag security lines at the Harbour Boulvard side of the Disney Esplanade. Once through security checks you are within a few feet of the entrance turnstiles.
Compare that with driving into Mickey and Friends parking structure, driving round and round, up and up each level to park, walking from your park spot to the escalator down to ground level, then going through security bag check, then waiting for a tram to Downtown Disney, then walking through Downtown Disney to the entrance turnstiles.
Wonderful!
We usually book the Hyatt Regency which is borderline walking distance to the parks, but the Ayres was a really good deal and we really don't want to walk an hour with a stroller!
Just be aware that the little one will have to be carried and the stroller folded on ART. Also the buses are small, so dont hold alot of people. This can be an issue when leaving Disney, so I always leave the parks approx 1 hour before park closing.