If using a significantly good password, from the beginning, it is pretty unlikely that anyone would go through the trouble or have the opportunity to watch you

If using a significantly good password, from the beginning, it is pretty unlikely that anyone would go through the trouble or have the opportunity to watch you enter your password. To me, it only makes sense to change a WiFi password for the following reasons: a) you care if people are using your network, or you do not simply keep track or whitelist-only of machines that have negotiated with your router b) you use a short -- "crackable" -- password c) someone can peer into rooms were they might spy on you entering your WiFi password d) (c) happens enough that they can make out the whole password For typical passwords -- desktops, laptops, email, etc -- it makes sense to change passwords (and use a password manager), but only for those things that really matter. Otherwise, there is probably not a lot of undo-able harm that can come of someone having access to your account(s) on <forum du jour>.