Most of the time, no connectors. If you need a CD Drive, ethernet, and ethernet connected all or most of the time, buy a different computer.
But some people want/need the 2 ThunderBolt connectors. I'm not happy because I had planned on purchasing 2 17" Ivy Bridge MacBook Pros. That saved me $6,000+. Then the lack of a new Mac Pro saved another $6-7,000. I've gotten used to Apple not needing my money. I want all of the ports that I can have & then some. In order to run my 4 displays that I run on my Mac Pro I need 2 ThunderBolt Ports.