As much as obtaining GCMS notes may have a placebo effect for some, to be clear there is RARELY anything learned from the version provided clients that the applicant does not already know or can readily infer based on what he or she should know.
There are some situations in which an application for personal records should be made. The vast majority of such requests discussed in this forum are NOT such cases.
As much as these reports may be reassuring to some, many others are perplexed by the cryptic entries and codes, distracted or even misled by default notations. More than a little anxiety has been fueled rather than soothed.
The VAST MAJORITY of qualified applicants who are confident they properly completed the forms can RELAX. The process works. SLOWLY. But it works. No need to micromanage. No need to fret. Watch your paper mail, your email, and your eCas, and respond accordingly to any communications from IRCC. Odds are all is well and on track. DON'T WORRY, BE HAPPY. (Unless you already have, and know you have, reason to worry. In which case the GCMS report is not likely, not at all likely, to offer you any useful information.)
But as others insist, sure, if placebos work for you, or you have a compelling need to feel like you are doing something and can pretend this is doing something, yes Canadians have a statutory right (what the law considers a privilege) to obtain personal records from an agency like IRCC.