I get what you mean about the timer feeling rushed sometimes, but honestly, I kind of appreciate it. Without it, I'd probably zone out and end up brushing the same spot for five minutes straight, lol. But if it's stressing you out, have you tried ignoring it occasionally and just brushing until your mouth feels clean? I did that for a while and found that eventually I got used to the rhythm without needing to stare at the timer constantly.
Also, random thoughtβmaybe it's the pressure of hitting every spot evenly that's causing stress? I used to obsess over that too, but my dentist actually said as long as you're brushing thoroughly and regularly, being perfectly even isn't as important as we think. Maybe we're all just overthinking it a bit.