No, 2009 did not have a leap second.

A second is 1/604800 of a week, so a year with a leap second has an extra 1/604800 week - this is small enough that it makes very little difference to a whole number, thus a year with a leap second has effectively the same number of weeks as a year without a leap second: 52 weeks plus one (or two if it is a leap year) day(s).

No. It's only a second; you won't even notice it. Unless you count every second during your birthday.

A leap is an interval larger than a major second or whole step.