It's important to note that an ADHD diagnosis does not necessarily end with stimulant medication. Stimulant medication can be helpful for some people, but it's not the only way to treat ADHD. Having an ADHD diagnosis could help you choose appropriate therapy methods, self-help practices, and other self-improvement measures. Of course, an ADHD diagnosis isn't necessary to begin implementing better time management practices, so I'd suggest addressing any issues you might have with time management, time boxing, and organization whether or not you have an ADHD diagnosis.
When it comes to stimulant medication anecdotes, it's important to separate them by how long the person has been taking the medication. You'll get very different answers from people who have been taking stimulants for 1 month, 1 year, or 10 years. One of the side effects (key phrase: side effect) of the first few weeks or months of stimulant medication is a sense of euphoria and extra motivation. Be careful, because this effect fades with time.
In general, I'd recommend focusing on anecdotes from people who have been treated for at least 1 year or more, while taking any reports from someone who just started medication with a huge grain of salt. In particular, I'd recommend ignoring any reports from people who are taking excessively high doses of stimulants, dosing stimulants sporadically ("as needed" isn't standard practice), or who just started taking a stimulant medication. The realities of decades of prescription stimulant have pros and cons, which aren't apparent in the first few weeks or months.
Also beware that some psychiatrists greatly overdiagnose certain conditions. Unfortunately, some practitioners are known to overdiagnose their pet condition, from depression to ADHD to anxiety. If a practitioner is pushing you toward a diagnosis or treatment you don't feel comfortable with, don't hesitate to get a second opinion.