I can transition between Adobe products with the same shortcut keys...and it always takes me a minute when I do things in Quark to remember what those are. It slows down my workflow.
The image display / loading time for InDesign seems to be much more accurate and functional than in Quark. I haven't worked in the newest version of Quark, but the version I had locked up all the time and crashed my system. That rarely happens for me in InDesign.