Designing for Experience

I am at the Participatory Design Conference and have really enjoyed the first official parts of the conference and during the opening keynote Finn Kensing he showed a Venn Diagram of several fields and that PD overlapped several including HCI, IS, EPIC, CSCW.  It seems that many times HCI user centered design or user involvement is like PD lite.  I guess you would have to say that a full participation in design in an ideal sense is richer than user participation in HCI as it is practiced now.

Are there any thoughts on this?