People who use left index Y, do they use it for specific words or don't think about it?

[fast bramble]

For people who uses both indexes for Y.

[bronze niche]

you work it into your typing style by trying to avoid using the same finger twice in a row since that will always be slower
but the goal should be not to think about it which comes with practice

'party' uses right index for 'y' because left index is busy with 't'
'shy' uses left index for 'y' because right index is busy with 'h'