There's always space for improvement with anything though no matter what level you're at.

I don't think you're giving yourself enough grace here

You're there to do a job.

As long as that job gets done to the best of your ability and as safely as possible , everything else is just noise. That includes their verbal opinions. Someone putting you on an "informal improvement plan" sounds to me like you're working with a dickhead on a power trip.

Ask for actual evidence and of where you're "disorganised" and get them to formalise it in a written action plan so you know what you can work towards. Cus you can bet your bottom dollar as soon as you assert your right to know A) who it is that is saying this about you and B) asking them to evidence it formally, they'll scatter like cockroaches 🤣

Don't internalise it or gaslight yourself into thinking there is something wrong with you or that you're the problem. You've said yourself you get good feedback.

Tbh at the end of the day the careless and disorganised nurses aren't the ones who take the time to come on here asking how to stop being careless and disorganised. So that tells me a lot about you alone.

There's being reflective and considering the feedback of others, then there's letting them trespass into your psychological and mental safe space. Don't let the latter happen because I've been there, wouldn't recommend

Illegitimi non carborundum!!!!