Well he kept Garland off the USSC, that's something, other than that I agree with you.
McConnell not only kept Garland off the Supreme Court, but he rammed through Trump's Supreme Court picks despite having a razor thin Senate majority that was dependent on RINO Republicans to confirm those justices. And there were plenty of conservatives who sneered at McConnell while those things were happening, convinced that he'd fold in the end. But he didn't.
The only way he was able to accomplish that was because he cashed in all the chips he had accumulated over the years by supporting those RINO's for reelection, and from protecting members from politically damaging votes that wouldn't have made the difference in legislation anyway.
In terms of maximizing votes on critical legislation, McConnell is probably the most effective Senate politician in at least half a century.