Shifting the 2008 Accord EXL auto like a manual

Hello,

I have a 2008 Accord EX-L and its an Auto. Everyone now and then I like to

put the car in 1 at a red light and shift up to 2 at about 4500 rpms and 
then to D3 at about 4500 rpms etc. I am wondering if this upshifting and 
downshifting practice is bad to do? I make sure that I don't put the gas
on 
until the transmission has caught the next gear. I wouldn't think so, but 
wanted other opinions.

I know what everyone is going to say "Why didn't you get a manual 
transmission??" Well the fact is I only like to shift every now and then,
so 
I would fall into the weekend shifting enthusiast category, and 
unfortunately I cannot afford to have two cars, so I have an automatic 
transmission car.

Thanks,
Al