The workflow has not changed much from previous versions so much that it is unfamilair and if anything it has improved. There are more ways for advanced users to get things done. Rendering is faster.
Two new features that wre to die for if you are still working in 5.5 are continously rasterizing layers and the text tool. You do alot of vector and broadcast design work these two items are mindblowing.
Continously rasterizing layers meaqns that you can import an EPS file and apply a filter and scal eit up and after the layer has been rasterized then the filter is applied… in the past you had to make a precomp and create a gigantic layer which slowed everything down.
The text tool is awesome… instead of doing your text lauout in illustrator or withthe the text filter you can use a PS like text tool and it has a very nice and very flexible text animetors. You can select characters to animate and apply an animator … you can layer these animators over one another to build complex animations with only on layer of text instead of having to chop your text into a million pieces which again slowed everything down.
Another plus for AE6 Pro is that it comes with Keylight which is a great keyer.
You can also now use AE6 with renderfarm software.
There’s a bunch of more stuff… AE6 is definately a must have.