Anyone who thinks family worship is not a discipline has either not tried to be consistent with it for any length of time or they have never tried it and are merely romanticizing it. It is a discipline. It is hard at times. It can frustrate you to no end. There may be times you half-way consider bringing physical harm to one of your little disciples.
Having said all of that, none of these are good excuses to not have consistent times of family worship. By the way, not every time will be difficult. Though “family worship times” are not commanded in Scripture, this is a discipline that has proven beneficial for children and parents for thousands of years. I can tell you from experience and from listening to older dads who raised children having family worship that there is no better way to raise your children in the fear and instruction of the Lord (which is commanded).