This is fun!
Mine are:
#1 - I don't care about the back of my projects, if I know it'll be covered somehow. I skip everywhere in favor of speed.
#2 - Even though I read you shouldn't lick the end of the floss to thread it, I still do it as I find it faster than using a needle threader, which I'll use only when I can't seem to make the lick and stick work.
#3 - I try to avoid re-threading as much as possible when stitching, so I'll stitch with a length of thread until I have the same length as the needle and can barely move the needle to the back to finish off running under other stitches.
#4 - I leave my project on the Qsnap, and I don't even worry too much about loosening it.
#5 - If I can't use the loop method and I am not working in Aida that I can use the pincushion start, I knot my thread and use a loop start with the knot.
#6 - I've had a finished project sit in a plastic back unframed for years and years. Back in Brasil framing was cheap, now things go unframed even longer unless I put them in a ready made frame bought at Michaels.
#7 - I'm stitching HAEDs and like how they stitch, and see a few that others stitch that I find pretty, but the majority of HAEDs are not something I'd invest years on, so it's easier for me to skip the frequent sales. I tend to be drawn to the Art of the Antiquities over there.
#8 - When I make a mistake, I'll first see if it will really affect the end result, and will try to work around it so I don't have to frog anything. Let's just say in Starry Night with all that confetti there's quite a few stitches put in the wrong spot.

Parking on it really helped cut those down.
#9 - I will sometimes "stitch" for hours, and only get half of that of actual work, 'cus I get distracted and stop often to admire my work or visualize the next colors and how it will look when this or that is done or the page is completed, etc. So yes, I go idle a lot while stitching.
#10 - I wish I could do all my work sewing method and in hand, but some fabric counts don't permit that. I don't care my work is all crumpled and stitches are more even in a Qsnap, I love the sewing method and have pretty good tension working in hand.