I have experience with inDesign and Photoshop as well, although not a whole lot. Not the newest version, but a slightly old one. Like a lot of people have been saying a lot of the newer features are the bandaid, healing tools, and some other special stuff to help you make your shops look cleaner. Nothing like a cat's head on Darth Vader's body and it looks like it's 100% normal. :P
I suspect that what may be good for you overall is the streamlining and improvements to the code. Newer versions should run faster and utilize your computer more efficiently. They should also be less prone to crashing. Since it's an Adobe product, it goes without saying that any update that helps mitigate crashing is an update you need to get.
Also, I can confirm that tablets work very nicely with newer versions. We have a Bamboo tablet we'll sometimes use with them and it works beautifully. The tablet and the program go together like a mouse and a computer.