When using the general view? Typically landmarks and buildings so I appreciate this change. Roads are most important when using navigation, which they made much more vibrant. I'm finding these to be welcome changes.
I do think that the highway emphasis is important, as you're typically traveling faster and you don't want to take your eyes off the road more than you have to. Having the bright yellow highway for things like complex offramps has been helpful to me in the past. I'll just have to see how it goes.