Yeah I've had a lot of experience with Doctrine. Had to roll my own orm on a previous project due to certain requirements and have been playing with orms since. Doctrine has a lot of nice standards and a good community around it.
I love Doctrine at work. I hate it at home. It's a great standardised system that that has a lot of great features we use, but for simple projects at home, it's far too cumbersome to set up.
syntas like $peopleNamedJames = Doctrine::getTAble("Person")->findByName("James"); foreach( $peopleNamedJames as $person ){ echo $person->getAge(); }
It's very Hibernate'esqe in some regards also.