I agree with what Sav said above. Initially it was fun following the automated quests around the map and gaining rewards along the way, especially alongside periodic events that happened every 10-15 mins. The enchants were also neat and added to the grindy aspect so that whatever chore we had to complete didn't feel too stale (though a few enchants have to be fixed and an enchant list MUST be added).
Now I said it was fun grinding for a while, that is until we get not even half way through the level progression. It is at levels 45 (for a lot of people at least) to 60+ where the grinding becomes an unfun kind of grind, at that point no other source of experience truly contributes to leveling up besides chopping wood. Farming, Fishing, even killing mobs at that point gives very miniscule amounts, as in we don't even see the exp bar move.
The other problem is when so many people end up at that point of progression and we all have to chop trees, the area is so small and there aren't very many trees to chop, some people can't progress when there are players with really intense tools taking all the trees to no avail. Even with enough trees, the overarching problem still stands that there aren't enough flexible ways of gaining exp without relying on ONLY one activity which even gets progressively slower and slower to gain exp with, to the point where it takes chopping 30 birch logs to gain 1% of experience, that is dreadful. We don't unlock the mining activity until we are level 75 which is so far away for a majority of the players(getting to 60 was already super tedious and boring with an exp gap of 60k to 10mil).
This game not only needs more quests to entertain and reward us more along the way, but there needs to be alternate RELIABLE sources of exp when we get to higher levels besides the new activity we unlock, because a lot of people stopped playing when that was the only way to level up after or even before level 60 (at an abysmally slow rate no less).