Who the fuck uses 7 point scales to rate something
4 = Neutral
3 or 5 = Little
2 or 6 = Somewhat
1 or 7 = Heavily/Likely
1-7 works very well for scales involving how you feel about something
e.g. Kinsey Scale has 1 as only interested in opposite sex and 7 as only interested in same sex. 4 is could go either way, 3 is slightly more into opposite, 6 is heavily into same sex, etc.
A 7 point, or Likert scale, is extremely common in a lot of fields, particularly psychology and social sciences.