It can certainly be entertaining
when these little devices actually understand you - but these cute little voice devices are massive data collectors. At least some companies are trying to be more responsible with this but keep in mind anything you "talk" to is in fact sending the data somewhere.
So - if you really find it easier to ask for the weather than to tap a button or look at your phone, go for it.
But do know that they must listen all the time to know if you are talking to "them".
Hopefully all reputable companies will only use information collected after the phrase that triggers the search or command.
But who knows. Food for thought.