I am a Design Suite Ultimate subscriber and heavy user and the programs are not terribly well integrated. Revit Architecture to Revit Structure to Revit MEP have always been the same program with different tool sets. Now they are all combined into one so yeah seamless integration there (though the collaborative tools are still far behind Teamwork).
Interoperability between Revit, NavisWorks, AutoCAD, CADmep, etc aren't particularly better or worse than with ArchiCAD etc. Autodesk has been pretty bad with IFC but that seems to have improved in 2014, particularly in Navis.
The speed bag is specifically for releasing pressure buildup due to modeling gravity pipe in Revit. Otherwise I find Revit just annoying not infuriating.
BTW: Revit to ArchiCAD workflows are far from seamless. It sounds like Revit probably is your best choice.