In addition to what was mentioned about the interest you won't be paying on that $10,000 in the future, like Brandi mentioned...you paid $10k towards the principal. Your regular monthly payments (you said of $1,000) do not all apply to the principal. Some goes to principal, some goes to interest, and some (depending on your particular mortgage) may go to an escrow account that pays out your homeowner's insurance and/or flood insurance premiums each year. So, ten $1,000 "regular" payments is only (estimate here) ten $400 payments towards your principal (i.e, $4,000). Not $10,000. There is a huge difference between $10,000 and $4,000. Right?
If you continue to pay all your regular payments as scheduled, at the original rates, you can just pull up a mortgage amortization schedule to find out how soon you can have it paid off. Without knowing your interest rate and such, I can't tell you numbers specifically, but you can just plug the information into the calculator (see the link) and it will tell you.
http://www.hsh.com/calc-amort.html
AND, you still will have however many years/months that you are not paying any interest on that $10,000, that you otherwise would be.
It is my understanding, that at one time, if you paid one additional monthly payment each year, starting at the beginning of your mortgage (on a 30 year fixed) that you would pay the mortgage off approx 7 years earlier than scheduled. An "extra" payment being the ENTIRE monthly payment amount (applied to the principal), not just an additional principal payment.
ETA: Additionally, for every subsequent "regular" payment of $1,000 each month, a larger portion of THAT payment will go towards the principal, and a smaller portion will apply towards interest. So, for example if $350 went to Principal and $650 went towards interest, and you made a large principal payment (like you did)... your payments might now apply as $400 principal and $600 towards interest. Over time, this happens with every payment anyway...just in much smaller increments, so you may not notice it if you aren't looking. But with a $10,000 lump towards the principal, you should see a noticeable difference in how each regular payment is applied.