It is. Not just the obvious, but once clipped, you are absolutely secure and connected with the bike. You have the pulling up on the pedals to help with hills and sprinting away from TL's. No danger of feet slipping off pedals.
Also helps on fast descents, again security and allows you to take some of the weight off the sit bones and your feet & legs start acting like suspension and the road becomes smoother and helps prevent saddle soreness.
If you ever rode with toe clips and straps, it gave you the same feeling of security, but if you tightened them too much you got poor circulation in you feet and used to hurt. Also to stop with these, you had to bend down and release the strap with your hands. With the click in pedals, you just have to twist your feet to get them out so a lot safer.
Good luck, keith