The key to feeling secure about a connecting flight is knowing how/if an airline might recover if your initial flight is late. The greater the number of options to get you to your destination, the better.
Sounds like you might be flying on Delta Airlines. I picked a random Saturday in July (7/13/19) to check their schedule. On that day, they have 15 nonstop flights between Atlanta (ATL) and Orlando (MCO). You mention that you will be connecting midday. I'm not sure how you define midday, but 9 of those 15 flights leave at 2pm or later. They basically have a flight leaving every hour.
Additionally, it looks like all the flights between ATL and MCO are on larger single-aisle aircraft. Delta operates a large number of different planes. The smallest planes have as few as 69 seats. But, the planes Delta is using on your route are the Boeing 737 and Boeing 757. Depending upon sub-type, those planes have between 100 and 180 seats.
I agree with
Fangorn. Given the opportunity for recovery (assuming you are flying Delta), there's little reason to stress out about your connecting flight. There are many options for Delta to still get you to Orlando later in the day if you initial flight is running late.
Edited to Add:
One thing that Delta does well is handling misconnects at their hubs. They have a software program that automatically rebooks customers on the next available flight. If you have their app, your new boarding pass will show up on your phone. If you're like me and want something on paper, you can print out the new boarding pass at one of ATL's many electronic kiosks.
Given the basic quality of your connecting flight (ATL to MCO nonstop), you should be fine with the auto rebooking. But, if for some reason it's not the best option, you can go to one of the Customer Service desks and ask if there are other available flights.
The only time connections make me think twice about making it on time is during the winter and connecting through places like ORD or MSP.
The belief that winter is bad for connecting is not supported by data. By far, summer weather causes more delays.
The FAA says summers storms are worse than winter ones, and here's the money quote from one of its fact sheets: "Unlike winter storms, which take time to develop and move slowly, summer storms can form quickly, stretch for hundreds of miles and travel rapidly over large portions of the country."
Source:
https://www.farecompare.com/travel-advice/5-surprising-things-bad-weather-flights/
As someone who used to live in Minnesota, I can attest to the fact that MSP is AWESOME in terms of staying fully functional over the winter months. Severe thunderstorms can easily cause massive delays during the summer months in hubs like Atlanta, Dallas, and Houston. Personally, if I had to choose between connecting in MSP in January and ATL in August, I'd choose Minneapolis 100% of the time.