I haven't flown the 737 in a bit now that I'm on the 767, which btw is a lot easier to slow down than the 737. The only thing you gotta keep in mind with reference to slowing down is ATC will not let you slow down to 210 a lot of the times. If you've flown in the states going into the NY area forget it. You will have atc come down on you the minute you drop below 270! When I was on the NG we quite often used cost indexes of 18-22 which will give you a descent speed of approximately 255-260. Don't know how many times ATC has said no way. Not when 50 aircraft behind you are coming in at 280-310. Best defence for proper descent planning is knowledge of what to expect from ATC like the OP said in his video "on a vfr day ATC will give you direct......". Other than that, it's annoying but dropping the gear has its benefits. Also as soon as you get below 10,000 start using the slats and flaps. Once held up high for way too long 40,000 and 45 miles from the airport we still made the runway without any deviation in our lateral track and still meet the stabilized approach criteria so it can be done.