Content in this game is what you make of it. If you are a casual player, you can do the story of the content and then logout the same day and return for the next patch.

If you want more out of the game there are rewards to farm such as mounts, minions, orchestrions, housing items and glamour.

For example, there is a new pvp series and that should keep you busy for a long time increasing rank to get the rewards and the island sanctuary is time-gated, so it takes some time to get all of the rewards. The new raids have glamour with effects and a minion to farm for. But a casual player wouldn't bother with any of these things and just do the content once.

The other post makes a good point as well, which is that the patch content is spread across smaller patches.