Good idea, though player-created tweaks which display an effect (some sort of glow) when you're using certain consumable items already exist and are a good "visual" workaround for this matter. Also it's not that difficult to just look at what time you've used something and add +X minutes to see when it expires.
Point I'm trying to make is that methods to make timing those consumables easier already exist, and I'd rather see the Devs focus on other updates for the time being (would definitely be cool to have it in the future though).