There are a number of reasons to use a specific framework in a work environment. But sometimes it boils down to just the hype. For example in recent past almost all the companies are trying to implement AngularJS and before that time it was the time for BackboneJS and the story goes on like that. It is always a good experience to work in very different kind of framework or for that matter its even better to work in different kind of languages altogether.
The last year was DOJO Toolkit year for me. I must say I am impressed to see features it provides and now that its moving in the right direction. For a long time now, this toolkit was just stagnant but last year only they have started moving again. Well, if you come from a pure Javascript background might not like it by the way it is designed and behaves. The UI layer of the DOJO Toolkit named as Dijit will seem like Flex components (If you know what Flash and Flex is, you will get what I am saying). The framework itself is designed to make people comfortable, who are used to Classical programming languages like JAVA. The whole toolkit will show itself, as a class based toolkit. The average user will just think and use it as a Classical programming language, which is the root of all evil things in a project. Thats part of the team and how it works with this toolkit.
In general if we talk about the features this toolkit gives us, I would say its nice and efficient if we use it the way it is meant to. The next version is already on progress and they are moving to TypeScript, that a nice move. All in all its a nice experience working with this framework.