I’ve been playing over three years now.
Here are a few ‘tricks’ I have used to help memorize a tune.
Try to identify the parts that repeat or are similar. Ben always points these out ‘…now this part, you’ve already seen before in measures…’ so try to catch them as you are going through the tab.
Try to use licks and phrases that you’ve played over and over (like a G lick or a 3-2 pulloff or that 2-4 open first thing) and use these as anchor points for your memorizing.
Try to identify simple rolls over chords that you know.
Really though, as you learn more tunes and gather more technique, the most important is to be able to ‘sing’ the tune in your head. Eventually you’ll get to a point where you hear in your head what you’re supposed to play and your hands will (well, at least more or less) play it.
As you have already found, it does get easier and easier. Keep at it and practice all you can!