How can I re-install a module?
The Devel module can also help here.

It makes a "Reinstall modules" page available at /devel/reinstall, which lets you re-install modules in bulk.

It's also worth mentioning Drush; dis (obviously) doesn't work any more, but pm-uninstall and en still do. And if you have Devel installed, you can invoke a reinstall with

drush dre module1 module2