a few ugly bubbles at blue tape line
With a little practice, you generally don't need to tape much at all.
I am just a humble DIY, and all I use tape for is to mask off unpainted quarterround away from baseboard, and also mask off door knobs.
There is no need to mask off walls from each other, or trim or glass. Read up in this forum (or online) on "cutting in". This will make your life a LOT easier, help you paint faster (because you won't spend so much time running tape), and will usually look better in the end.