Yawn. Firefox alone accounts for anywhere between 1-3 GB with all my tabs.
This is on an i7-5820k and Nvidia GTX 970 with 32GB ram - a PC that ranks 97% world wide in 3dmark.
The plural of anecdote is not data. For example, on my setup, an FX-8320 with 8GB RAM,a GTX760, and not an SSD in sight runs Minecraft just fine with a couple of mods.
Last but not least, while I understand popularity and ubiquity inspire varying levels of contempt (I'm certainly not innocent on the issue), I've never really understood technical arguments against games. Sure, you have your Arkham Knights, which provided insurmountable problems for a not-insignificant percentage of buyers and deserve a critical look at the code.
Then you've got Minecraft, played by literally hundreds of millions of people with little to no problems, including my 8 year old niece on her potato PC.
There are many things which could be improved in Minecraft. Whether it's going to gobble up 2GB of Ram versus 3 or 4 or 6 isn't that high up on the list.