I’ve been looking all around control panel for the advanced appearance settings they had in XP, but I couldn’t find it anywhere. Eventually, I found a forum post that made me realise how ridiculously easy it is.
Right click the desktop > View > Small Icons
>_<
Then I found a way to customise the size even more, thanks to Keith Dsouza over at Techie Buzz.
Click the Ctrl key while you are viewing the desktop and scroll your wheel upwards or downwards.
In my defence, I’ve been using a trackerball mouse for the last 8 months and only just plugged in an optical with a scroll wheel today.