In the past 3 months I worked on a new frontend project at work using "new things" like vue.js and webpack including Babel polyfills on production for the first time. Now the project is almost done an I've been sent on to other tasks on our older projects to help follow the deadline at these projects.

It is a hard cut to switch my head back to the old legacy code after this long time only working with the new stuff and technologies. I feel much less productive at the moment, because I know how much time I could safe if I just could use the new technologies. But there is now way around this. Finally I now have to maintain Symfony 1.2 and jQuery again instead of building new awesome stuff in this exiting new technologies.