This week's book giveaway is in the OCAJP forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide 1Z0-808 and have Jeanne Boyarsky & Scott Selikoff on-line! See this thread for details.
Decoupling your logic from presentation is a start. Also, since XSLT is an abstraction at this point, it decreases the complexity of your code. If you need to do something that XSLT does, you'd pretty much have to duplicate XSLT's feature set -- not much fun in my book.