No issues here with Windows 7 either, I have it running in 64bit on my main desktop and 32bit on my netbook, no issues at all there. With my desktop, I have had AutoCAD Mechanical, EdgeCAM, Itunes, Media Centre, Adobe Lightroom, Photoshop and Illustrator, Word, Outlook and about 1000 tabs in Firefox open at the same time with no issues, and not using more than 50% of system resources (HP Media centre PC, Intel Core2 Duo E6750 @ 2.66GHz, 4Gb RAM)
With the quick launch toolbar, they have replaced it with the ability to "pin" applications to the task bar, if you right click on the open program icon on the task bar, it gives you the option to pin it there, once this is done, the application stays there even if it is closed.