I don't like and don't go to the dentist often either and when I do they always want to 'flay the gums' to clean below the gumline, or whatever. Sometimes I let them, sometimes I don't.
Cavities I always have them do tho, even if I'm not in any actual pain.
Wisdom teeth...if they're impacting or close to doing so, have it done. If they're not...well, you can probably put it off a little while, as long as you have them checked frequently. Some dentists want to pull them on principle as soon as they notice them rather than when absolutely neccesary.