I like walking trousers like Craghoppers which have lots of pockets including zippy ones. These days I find the actual Craghoppers don't fit me well, so I trying to add the features I do like into my self sewn pieces.
On holiday in particular a nice zipped pocket is super handy for important stuff like key, money, passport etc.
I really like pockets, particularly in trousers, and find if they are supported by the waistband and the bottom of the pocket sits to the front in the leg bend area, then its not adding too much fullness as its in the space between my full tummy and my full upper front thigh.