You don't need to say Hagomel.
Your case is not included in the four who have to thank in Gemara Berachot 54b, which are paradigms linked for Birkat Hagomel:
Rab Judah said in the name of Rab: There are four [classes of people] who have to offer thanksgiving: those who have crossed the sea, those who have traversed the wilderness, one who has recovered from an illness, and a prisoner who has been set free.
The above is really congruent with your observation but I think that your case is included in the below halachot on Rambam, Ahava, Berachot, end of chapter 10:
If one departs in peace, he should say: I thank You, God, my Lord, for allowing me to depart in peace. As You have allowed me to depart in peace, lead me [on my way] in peace, direct my steps in peace, support me in peace, and save me from the hands of the enemies and lurking foes on the way.
The general rule is: A person should always cry out [to God] over future possibilities, asking for mercy. He should thank [God] for what has transpired in the past, thanking Him and praising Him according to his capacity.
Whoever praises and thanks God abundantly and continuously is worthy to be praised.
The significance of to be far from a disaster is only an enlightenment of last sentence above. Through this we understand how great is the need to thank HaShem when all is OK. Some Rishonim said that routine life is made by nisim nistarim. Through avoiding a disaster recently, you can realize this and say this prayer with a great feeling every time that it is necessary .
I have seen the link of @mevaqesh, in name of Rav Soloveitshick and rav Bick. At first glance the examples cited have a great similarity with the four items listed in Gemara:, a danger was identified at some time, generating fear. In this, poskim linked them to the four paradigms. In the case of the OP this characteristic is absent. To extrapolate needs strong arguments.
The Mizmor Yoshev Beseter Elyon (91) talk about the avoided problems.
For he shall save you from the snare of the fowler, and from the noisome pestilence. He shall cover you with his feathers, and under his wings shall you find refuge; his truth shall be your shield and buckler.You shall not be afraid of the terror by night; nor of the arrow that flies by day; Nor of the pestilence that walks in darkness; nor of the destruction that wastes at noonday. A thousand shall fall at your side, and ten thousand at your right hand; but it shall not come near you.