I think anytime a boss is micro-managing an employee is an example of being too bossy. However, it depends on the experience and skill level of the employee. If the employee is new or the project is new then there is more need for supervision at first. However, if the employee is experienced and skilled then delegating a task and checking in is much more effective then constant supervision.
In terms of being too friendly, it's great to chat and get to know your employees but i think one can be too friendly when he/she starts to share personal stories. Deciding what is too personal to share is where that fine line comes in. A great way to think of it is whether or not you would share the same story with a stranger or with your grandmother?
