Some thoughts from one who wears hearing aids -
I've been in this audio hobby for nearly 50 years and have worn aids for the past seven. The question of comparing before and after is difficult to answer because for most of us, hearing loss is gradual. Studies show that most adults begin to lose high frequency hearing by our late 20s. Still, I was not aware of my hearing loss until my late 40s. And then I (stubbornly) waited another ten years until it got bad enough where I had to do something about my loss.
As others have noted, significant improvements have been made with these devices in recent years. Three points should be made. First, modern digital aids can be fine tuned at several frequencies between 250 and 8K CPS. Second, sounds can not only be boosted but masking can be introduced to help intelligibility. Third, great PATIENCE must be exercised during the fitting/adjusting process. Expect to make several trips back to your audiologist for proper adjustments. And keep in mind that the industry focuses on speech, not music, so not as much is known for best settings for music listening. I probably went through 3-4 adjustments before we got the full frequency balance of music set for my aids.
After all that, it is certainly worth it for me. And for those who fear they may lose enjoyment of music, let me say I enjoy it more. Plus I have amazed a few non-hearing aid wearing friends with my ability to still distinguish subtle sonic differences in equipment and software.