Are patients always intubated during every surgery? like for example a laparoscopic gallbladder surgery? or is it only complex surgeries that are long?

No: Many smaller procedures can be done without intubation. Simple procedures may not even require general anesthesia. It depends on the surgeon, the anesthesiologist, the procedure, the patient, the support staff, and the facility. Lots of factors... and almost none that a patient has to worry about. The professionals will figure it out, but if a patient has a strong preference, she can tell her Dr.