Your sentence Tech starts to look the same after you have seen so much of it. resonates with me a bit (I'm 43 and have made my living as a developer for over 20 years). What happens a lot is some old idea is dusted off and becomes a current fad. Sometimes this is because the old idea was a good one, but sometime it's because a younger generation is ignorant of history and why that idea didn't work the last time it was tried.

So sometimes there a feeling of "What! That again??" when some topic such as "NoSQL" comes up, but that doesn't, to me, make tech in general less interesting.