I've definitely felt it myself when traveling - summers feel noticeably different than they did even five or six years ago. The heat waves hitting southern Europe aren't just media hype. There's solid data showing that extreme heat events have gotten more frequent and intense, particularly in places like Spain, Greece, and Italy. You're seeing real record temperatures, not just recycled stories.
The tricky part is separating long-term climate trends from year-to-year natural variation. Some summers will be hotter than others just by random chance, but the overall pattern since the mid-2020s definitely leans toward more frequent extremes. It's not that every summer is record-breaking - some are closer to normal - but the baseline has shifted, and you get fewer of those mild years than you used to. Media does amplify it (because extreme temps make good headlines), but there's substance behind the coverage.
For your trip planning next year, the practical takeaway is that you should prepare for heat more seriously than you might have ten years ago. Pack accordingly, plan indoor activities during peak afternoon hours, stay hydrated, and maybe book accommodations with air conditioning if you're going to southern regions. That said, people still manage fine during European summers - it's just worth taking the heat seriously rather than assuming it'll be like a postcard from the '90s.