I run Gnome and Debian. I looked a bit at the System Monitor. All the standard unix tools (like cron...) are tiny. They only use few Kb. They big consumers are gui related and the heaviest is Firefox with 500 Mb. I have 4Gb of ram.
I have 1GB, but yes, all system tools are tiny. Browsers are heavy. Chrome was very light until some time ago, but now it is as heavy as Firefox.
Some webpages are use a hell lot of memory.
But there are big problems with webapps, too. For example, there are small apps that do super basic things and that can't be run on a Heroku free dyno. Mainly those written with Ruby on Rails, I guess -- like Discourse, and other small apps I've seen, but I've seen others.
I run Gnome and Debian. I looked a bit at the System Monitor. All the standard unix tools (like cron...) are tiny. They only use few Kb. They big consumers are gui related and the heaviest is Firefox with 500 Mb. I have 4Gb of ram.