It is also common to have technical designers on a team. These are designers who may implement some design in whatever scripting language the game engine supports. Therefore, if you are familiar with programming you'd open a larger set of jobs you are qualified for.
Otherwise, It is good to be comfortable with technology. It is often the case that tools will be built in house that you will need to use. Some examples include achievement editors, item editors, etc. These tools might spit out to an intermediate file format, be it json, xml or even insert into a database. It is not unusual to have to merge these files with other designers changes or even edit them manually. You will also need to be comfortable using version control which can be intimidating at first.