[IntrepidPig]

If you long press the volume bar in control center then it opens a larger version you can drag to adjust more precisely.

[Obscurity4340]

Also if you pull down the today center or whatever it is on iOS, it has a music player interface you can drag the volume there too

[socalgal2]

You are my hero! Does this get added to the list of worst controls though since it's so buried?

[fgd135]

You can also just drag directly on the slider that appears on the side of the screen when you press the volume buttons

[HelenePhisher]

Lovely. Never would have thought about that. Thank you!

[ggsp]

It's already included in the list, between the pricing UI and the Windows XP disks