The inevitable problem is cars in both lanes are doing around the same speed, or when you try to go around to the right lane and pass the car in left lane, they suddenly decide to speed up 5 MPH and leave you stuck again. If it's not hard to go around to the right or left, then why not just return to the right lane until the need to get in left again. It's the proper way. 2-3 lights or turn lanes in close proximity is the allowable amount for someone to hold up the left lane. Otherwise, stay right.