As a Biomedical Engineer, do you typically spend more time working on the computer with models or programs or with prototypes and physical objects?
All of those are tools in the product development process that you will use. Develop your skills in all areas and you will have more choices in what you spend time on. Always make sure you are learning new skills.
There are various areas of bio-medical engineering but the link below would give you a taste of what you are going to see.