I have a hard time with this and I also sleep with exceptionally good ear plugs.
My solution was to purchase an alarm clock made for people hard of hearing.
It has a mattress shaker in addition to a super loud alarm, either can be toggled. I typically use the mattress shaker. The first time I used it I sprung out of bed in a panic because I thought that the building was collapsing, so I can verify they are very effective.
Things you can do to prevent yourself from returning to sleep after disabling the alarm include putting your alarm at the foot of the bed instead of to the side of the bed (This way, you have to physically get up to go turn it off), and insuring it is warm in the room when you get up (If it is cold, you will instinctively want to go back underneath the covers). A space heater on a timer set to begin 15 minutes before your alarm goes off helps with this.
Another reason people don't want to get up is because they have performed no real preparation for waking up. By this I mean to have your coffee machine timed to preheat just before you get up, set up your breakfast the night before so that it is easy to make and consume in the morning, have the clothes you intend to wear laid out so that its easy to get dressed, etc.
In short, it is generally good to make it difficult to keep sleeping, but also easier to wake up.