The convention center isn't right across the street from DL, but it's definitely not a couple of miles away either. From DL, it's down Harbor, across Katella, and maybe another block down. Some people walk to DL from the convention center hotels. Others take a hotel shuttle, the ART, or the bus from the Toy Story parking lot. We went with DH to a convention several years ago. We stayed at the Anaheim Desert Inn and Suites, right across from DL. He walked to the Hilton (right next to the Convention Center), several times. He said it was a little long, but not too bad. You could stay at the one of the hotels at the corner of Harbor and Katella and be within a fairly easy walk to either place. There's a new Springhill Suites at the corner that looks nice. There's also the Desert Inn and Suites (different from where we stayed, similar name). There's also the Ramada Plaza a little ways down Katella, next to Garden Walk. If you want a nicer place, look at the Hilton or Doubletree. You can easily pick up the ART to and from DL.