Is it just me, or has Gmail's spam filtering gotten worse? In the past month or so, I've had more false positives end up in the spam folder than I've ever had while using their service. Emails from all sorts of valid places:

• My online pharmacy orders
• Electronic receipts from The Home Depot
• Bug reports on GitHub / GitLab
• Notifications from NewsBlur, my RSS feed reader of choice

Every time one of these false positives occurs, I click the "Not Spam" button, but it doesn't seem to make much of a difference. Has anyone else seen anything similar? It's really rather frustrating.