I've transitioned from rails-everything to working exclusively with front-end frameworks and libraries (react, angular, polymer), and I'll tell you this still: if I'm working in rails, I use turbolinks. It's a wonderful approach, way under-appreciated.

When two or more things on the page need to know about each other/you require a high-fidelity interaction that you can't easily handle with just it, then yeah - reach for vue, react, or what have you. But no need to start there! Use those as targeted air strikes