If you have the Vimium extension [0] then double-tapping the ] key goes to the next page on most sites.
0: https://chrome.google.com/webstore/detail/vimium/dbepggeogba...
On Firefox, Tridactyl[0] does this too.
Which link it follows as is based on the rel=next (or prev if you used [[) attributes (i.e. the actually correct way that web pages all too often do not use) and then falling back to heuristics like the button/link text.