The real gap isn't between a Dyson and a drugstore dryer - it's between a cheap dryer with uneven heat and literally any mid-range ionic one with consistent airflow. If your current dryer is heating unevenly, that's your main culprit for frizz. You could grab a Revlon or T3 ionic dryer for $80-150 and probably see a huge improvement without the Dyson price tag.
That said, the Dyson does have one thing going for it that cheaper models don't: the motor placement means you get genuinely faster drying with less heat damage overall. It's not magic, but if you're someone who blow-dries daily, that matters for long-term hair health. The question is whether you value that enough to justify the cost difference. For most people, a solid mid-range ionic dryer solves the frizz problem completely.
If you're hesitant, start with something like a Revlon One-Step or an older T3 model (sometimes you find them cheaper). Use it for a few months. If your hair still feels fried or the frizz comes back, then you'll know whether you actually need the premium option. Your friend might genuinely love hers, but that doesn't mean it's the only solution for your hair.