In the end, Rhino's 'free-er'model just makes it too fast for me to want to use a parametric modeller...unless I really need to verify the motion. Alot of times, I'll still prefer Rhino, and just do some dynamic rotation around key points instead of trying to work in Alibre. I only use that if I absolutely need multiple simultaneous constraints.
I agree I find Rhino more fun and free. It just depends on what you need to do. If I only had to do concept modelling every day I would use Rhino. My job is too much design engineering where a parametric feature tree is a must have. We have some customers that use Alibre, but I have never tried it. I heard it was just a cheaper knock off of Solidworks like you said.
Since solidworks 2006 you can do all of your sketching in one 3d sketch and create multiple features from this. Before you had to make a sketch for each loft guide, and each profile of the loft. Now all that can be done in one 3d sketch which is in a way like Rhino. 2007 also has a new freeform surface where you can push and pull points, but it is severly limited at this point because you can only use it on 4 sided surfaces. They claim they plan to make it work for any type of surface in the future.
The tradeoff for a parametric modeller vs something like Rhino is you spend a more time upfront creating surfaces and solids than you would in Rhino. The advantage is when you have to change something in your model that you did earlier all of your model reacts and updates accordingly. With clients there is always lots of changes that is just the way it is. A design is always in flux.
I totally agree that Solidworks has childlike windows xp icons that need to be redone. Its just the best thing out there for the price and type of work I do. It has become the industry standard for a mid range cad application replacing apps like Pro-E. Back in 1999 when I first started using it was way worse than it is now. Although the funny thing is it was more stable back then. Sheesh I sound like a fanboy don't I. Show me the next best thing though and I will jump ship in a second is my attitude.

Industrial Designer
Concept Center International
www.ericlagman.com