I don't remember him making it matter at all honestly. I remember Dolph Ziggler arguably making it matter that one time when Miz was champion.
I mean sure, Miz with the title was more significant than when guys like Wade Barrett, Curtis Axel and Ezekiel Jackson had it.
But, I put Miz on the same tier as champs like Rollins, Ambrose, Ziggler, Jeff and Kofi. Upper midcard workhorses who feel like they give the title credibility, rather than guys who are given the title so that the title can give them credibility.
The GOAT IC champs in my opinion include Gunther, Jericho, Razor, HBK, Mach, Perfect and I guess Honky if I must include him