Giving Thanks at Meals

You know how it's common practice to give thanks before a meal? I found it interesting that Deuteronomy 8:10 indicates that the thanks should be after the meal:

When you have eaten and are satisfied, praise YHWH your God for the good land he has given you.

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Ever noticed how often someone is asked to give thanks for a meal, and they pray about everything under the sun, and never actually get around to thanking God for the meal?

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Ever noticed how it's common courtesy to say "thank you" to someone who holds open the door for you, but it would be bordering on insanity to stand there and thank the door-holder for being a good citizen and holding a job to support his family and refraining from theft and telling him how nicely dressed he is and how you'd like it if everyone were as courteous as he and would it be possible for him to hold open the door for the little old lady coming down the street, and and and. This is kind of the way I view giving thanks for a meal. Why can't we just say, "Thanks, God, for this meal; we appreciate it", instead of turning it into a long-winded cover-all-the-bases prayer?

Just some thoughts....