I've become an avid berry farmer since D/P/Plt. So much to the point where I have all the berry information in a notebook for when I'm on the road and can't use the internet or a computer. I have at least 50 of each of the 'uber' berries you could only get in events, and it's still not enough for me. I have to keep planting them.
In plat, I did plant them but always forgot to pick them and only ever did pick them if I walked passed them <_<
In HG/SS, however I checked my Berry pots everday. So much more easier than the last game it was truely great. I then became a bit of a berry farmer ^^
I love planting, more so in Platinum because I constantly go back and forth between Solaceon Town and the Fight Area, with a whopping twelve spots to use and easy access to them. HGSS could be convenient for some, but not for me as 4 pots is less than I was expecting when the Berry Planter was announced and giving its key item status, I usually forget to water the trees.
I definitely plant berries. Pretty much every chance I get. There are two berries specifically that I plant everywhere. Leppa berries and Wiki berries. Leppa berries because they refill a Pokemon's PP, which definitely comes in handy during the Elite 4 matches. The Wiki berries I grow specifically for evolving Feebas. I have found them to be a very good berry for this task. Other than that, I only plant the berries which are used to create the Poffins each Pokemon in my party likes.