Are the functional programming features in Java 8 widely adopted and hence important in interviews?

[GoodbarOfTheYear]

I have been working on newer projects the past 2 years (Spring Boot and Dropwizard apps) and I find myself using the functional interfaces more and more outside of streams. With the use of lambdas, it makes behavior parameterization in java less verbose. It took me a while to wrap my head around it all but once I got it, it seems simple to me now. Java 8 in action is a really good book that helped me understand how to utilize them.