The response time for a "Create ticket" flow gets in the way, I like how snappy Trello feels, I can create a ticket in seconds with just shortcuts and a few keystrokes so it's pretty effortless to split a task in multiple tickets to be worked on. The clickety-clicky nature of Jira gets in the way for that, I need to click "Create", then select the "Project", then click on the modal's text box for writing the description, it doesn't support Markdown so I need to keep in mind (increasing the cognitive load) how Jira's formatting work. Then I need to click "Create" while checking the box "Create another" so I can keep the flow of adding more tickets.
Over time this workflow is fucking terrible, sometimes I avoid splitting some larger task into multiple tickets because I can't be bothered to go through this flow yet-again.
If Jira just simplified the way to create tickets, throwing them into an "Inbox" to be sorted later it'd improve the experience a lot, the way it's designed doesn't help to be fast with it and breaks my train of thought.
My workflow right now is to open a text editor, write down all the tickets I want to create, their descriptions, etc. and later I just copy-paste into Jira's UI when I have the energy to go through the whole song and dance of creating tickets.
It's death by a thousand cuts, the ergonomics of it is pretty bad.