It is certainly possible that a STEM major will be easier than a humanities major for some students, including you. This is not necessarily true for other students.
Subjective value judgements exists in STEM fields. For example, when doing engineering design, how much extra of something (e.g. effort, material, cost) is it worth to put into the design to improve some aspect (e.g. efficiency, usability, size, cost, reliability) of the final product or process by some amount? Also, STEM people need to write up their findings and designs both for others in the same field and those outside the field, although the writing skills involved are not necessarily the same as those involved in analyzing literature.