After two years of using the current main menu layout, I can honestly say it is quite clunky and unintuitive.
It requires too many clicks to do even the simplest tasks.
Fortunately, I recently discovered a mod by Anne_HK called Old Main Menu which reverts the layout back to its original state.
This makes it much easier to access single player modes, settings, mods, and replays.
Additionally, it eliminates the need to go to the single player menu when wanting to spectate a multiplayer game recording.
Unfortunately, Quick Play matches cannot be started from this layout.