I've got two MacBook Pros (work and personal). Truthfully, I haven't stuck a disk in the drive ever. Software isn't loaded from disks any longer. Movies and music is now streamed, not played from disks. The new model is just called the MacBook. The line up now has the MacBook, MacBook Air, MacBook Pro. Both my MacBook Pros are 15" models but now since I use Thunderbolt monitors at home and work, I'm considering going to a smaller model. The Pro used to come in a 17" model as well.
The MacBook only comes in 12" models
The MacBook Air comes in 11" and 13" models
The MacBook Pro comes in 13" and 15"