Probably the biggest reason you should consider replacing your opener is the advanced safety mechanisms that newer models have. The most important mechanism is the reversing mechanism, which uses two sensors on each side of the door and an infrared beam. When the beam is broken while closing, the door automatically goes back up. This keeps you safer and can help prevent major garage door repair when the door closes on something in its path.
Newer garage doors and openers are also safer than older models. It's harder for an intruder to gain access to your home via your security code with newer model openers that utilize rolling code technology to prevent the code from being stolen and used to break into your garage.
Older garage door openers are notorious for being noisy, and in fact, depending on the location of the bedroom, they've been known to wake up occupants in the early or late hours of the day. Newer door openers use mechanisms like a belt or screw drive rather than a chain drive to significantly cut down on the noise during door operation.
Older garage door openers typically didn't come with keypads that could be mounted to the outside of your garage. This is helpful when you don't have the transmitter from the vehicle or have children that need to access the garage. There are even advanced models requiring only a fingerprint.
Older openers become glitchy after time, so you can enjoy better performance with a newer system. If your opener is struggling with consistency, you may want to replace it with a model you can rely on. An attractive feature of newer models is battery backup so that you're able to use the garage door even during a power outage.