They allow you to use more complex statistical analysis and provide more detailed and useful information than other sorts of data types (e.g., yes/no or true/false). In addition, many participants are very accustomed to Likert-like scales, and require little instruction on how to properly respond to those items.
Here's a basic example of a likert like item:
Was the above referenced question interesting to you?
Strongly Agree
Agree
Neutral
Disagree
Strongly Disagree
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