I work in critical care. I round with my attending, present my patients, we come up with a plan of care. I outline my plan for the day and he may/may not have changes or suggestions to add. After rounds, I go put in the orders we decided on, if I didn't already enter as we rounded. The nurses throughout the day often come to ask me for orders for things (meds, restraints, changing orders po to iv, iv fluids, vasoactive med adjustments) and I decide whether to place the orders. If it's a patient I'm not familiar with or a serious issue, I may discuss with my attending then decide what to do and let the nurse know, and enter the order. If it's something I am comfortable handling then no, I just put it in and later when we round at the end of the shift or when I do my signout, I just let them know what I did for each patient.
I do not put in orders for the physician, I am not their scribe. Unless we are rounding and whoever isn't presenting the patient usually enters the orders for the other.
Sometimes we disagree sure, and if they explain and I see what they mean, I may change the treatment plan. Some are more "do it my way" than others and I usually just go with it. If I truly disagree, I would tell them to do the order as I am not comfortable - but I have never had that level of disagreement with one of my colleagues so far. There are many ways to skin a cat, as the saying goes, and with medicine there are usually many opinions and no black or white answers. It's a team practice and we all have equally valued input.