let me guess... you went on a saturday.
PKI is ALWAYS slow on a saturday. don't you go blaming the park employees for the slowness. blame your own stupidity for going on a busy day.
And, from personal experience, rides would go a LOT faster if fat people didn't try to cram themselves into coasters they know they can't fit on. rides would go a lot faster if parents would not try and sneak their kiddies on when they're too short. Rides would go a lot faster if people would obey the rules.
IMO rarely is a ride slow due to employee's fault. Usually it is the park guests not obyeing the rules that makes things go so slow.
as for "old coasters" did you completely over look the area called Action Zone? Those rides are not that old, and they're still a lot of fun.
and there is one "old" ride that is a legend, it's age is part of what makes it famous. it's called The Beast. it's old, but it's still fast, and still fun.
If you don't like PKI, we'll be very glad not to have you back. No one likes a whiner. It's only a matter of time before Six Flags gets to you, trust me.
and the fact that you went to KI alone says a lot. KI is always boring by yourself. Grow up, and stop whining. The world is not out to please you, nor does KI care what one person thinks.