You have been flying too much if...

...you look for a checklist when you get into a rental car
...you call the nearest ASOS for WX before you go out to the garbage bins
...you say you were born in "one thousand niner hundred seven five"
...you drive on the dividing line of an empty street
...someone tries to approach you with an innocent "the weather is fine today, isn't it?" To which you eagerly reply with a sudden flood of high pressure systems, clear air turbulence and various anticipated WX developments
...you scan the sky for traffic on collision course when driving
...you spell out the eye exam letters to your optometrist using the ICAO phonetic alphabet
...absence of obstruction lighting on your roof makes you feel uncomfortable
...counting sheep jumping over the fence makes you feel anxious, not sleepy (naturally, it's your airfield fence and you think about animals on the rwy). You prefer to imagine preflighting your plane in order to doze off peacefully.
...driving to the airport in light rain, you switch off the windshield wipers to make sure you'll have enough visibility in your small (non-cat-II :-)) plane when you take off.
...driving to the airport at night, you turn off the headlights and switch to your position (parking) lights, while crawling at the speed of a "brisk walk".
...prompted by an analog clock image (no digits) on your workstation screen, and seeing it at a quarter to twelve position, you acknowledge the high pressure system that has just moved in and look for a knob to adjust it to the correct local pressure setting.