Not really, just go look on steam at your play time. Unless all your doing is idling, then it's fairly accurate.
I've only been a member of Steam for 13 years, yet I've been playing games for about 25 years now, so it's not as simple as that. Plus even from the last few years when I've mostly used Steam to play games, there are a bunch of great games that don't show up in this list, like Mass Effect and the Assassin's Creed series.
Also, some games just take longer than others. Just like a book of 500 pages is not necessarily better than one with 100 pages just because it takes you longer to finish it.
Now, if you have one game that has hundreds to thousands of hours more than any other game, you probably enjoyed it a lot. Though I have read a lot of players really regret the amount of time they spend on games like WoW or LoL.
My top game in Steam is Civ V with a little over 500 hours, but that's for a large part because I played it a lot with my wife, who really likes it. Which is another part of the equation: some games you might have played a lot because they're the games your friends like to play.
The second highest is Skyrim with a little under 300 hours, combining the classic and legendary edition. Considering the next 5 games are all around 100 hours, I've played a lot of Skyrim relatively. Then again, Skyrim has a ton of content, even without mods.
However, what's most obvious when I look at my Steam list is how many games aren't there because I didn't play them through Steam. As far as Steam is aware, I've only played about 70 games.