Another great Mumsnet divide! Every time this question is asked, the responses are split between those who have wood and say 'never again' and those who have it, and are evangelical about its merits (obviously you can ignore those who've never had it, but still have an opinion on it).
OP, I think you can disregard anyone who reports a bad experience with wooden worktops who HASN'T pre-treated them with Osmo.
Osmo oil really has been a game-changer for the installation and upkeep of wooden worktops. Nothing matches it, so don't consider any other oil (even if your kitchen fitter or worktop supplier swears by it). Just look at the reviews on Amazon (and this site, through the search function) and you'll see how well rated it is.
If you do find anyone reporting problems with wooden worktops who HAS used Osmo (don't think there has been one on this thread yet, but maybe they exist!?), I would wonder if it is down to how careful people are. I wouldn't class myself as being particularly careful (typical family, including a child who soaks the kitchen every time he washes his hands, takeaways, throwing keys down etc) but we do wipe up water and food spills promptly, and always use trivets etc for hot items. It becomes automatic, so for the previous poster whose DH was worried she'd become a nag, I found that once they are installed and looking pristine, it's second nature to start wiping up spills, and then by the time you realise that actually (with Osmo) they are more resilient/forgiving than you think, the habit has become ingrained.
We've had ours in our kitchen for 4 years, and have yet to re-Osmo (although we will do so soon as the finish isn't as smooth as it was originally). We also have wooden worktops in our utility and cloakroom - all treated with Osmo and no problems with any of them.
We bought all our worktops from worktopexpress.