I recently switched to using gulp and webpack (to build react.js) after having used grunt for many years and I would encourage anyone still using grunt to make the switch. All that pain and suffering to get your grunt build to work will not be a problem. Setting up gulp is painless. It just worked. My setup is less, jshint, wepback with react.js and bootstrap.
I encourage people to use webpack for any kind of js building unless you're using browserfy, but you can use browserfy with straight up gulp. You could also replace browserfy with webpack. Webpack will build your require.js (and your commonjs) without need for almond.js if you're making single builds. Setting up require.js with grunt was a nightmare, and a cinch with gulp + webpack. Like it took me an entire day in the past with grunt, and like 5 minutes with gulp and webpack.
I encourage people to use webpack for any kind of js building unless you're using browserfy, but you can use browserfy with straight up gulp. You could also replace browserfy with webpack. Webpack will build your require.js (and your commonjs) without need for almond.js if you're making single builds. Setting up require.js with grunt was a nightmare, and a cinch with gulp + webpack. Like it took me an entire day in the past with grunt, and like 5 minutes with gulp and webpack.