Where I worked 20 years ago term used the term colleague. It was away of saying we value you as a member of our organisation, everyone plays an important part, we are all in it together- before they outsourced your job to India or cut back your Ts&Cs while the senior execs gave themselves huge bonuses. I think ASDA were using the term then as well.
Don't mind that so much when used correctly, but I do object to signs telling me to, for example, speak to a colleague. I don't work for your company, I don't have any colleagues here !
I have been retired for almost 13 years now and we used colleague and team member well before I retired. Staff member or member of staff was reserved for formal use...ie documents, formal meetings and so on. For me as a manager, I would use colleague when I wanted to imply equality and team member when I was speaking as the leader of the team.