Drools Guvnor provides a set of collaboration tools, but not a wizard about how to create your processes. I think that this is because you can create very different things mixing process, rules and events that it gets difficult to standarize a design/modeling pattern that fits for all the use cases.

You should take a look at the docs, where most of these questions are already answered. (www.drools.org and www.jbpm.org)

Cheers

                Does the solution provide human interaction/workflows integration when modeling processes?

Yes.

http://docs.jboss.org/jbpm/v5.2/userguide/ch05.html#d0e1224