Congrats on the switch, Cheryl! You're going to love it. No limits!
I'm a drag & dropper too. I usually bring in one item at a time (it's just my workflow), unless I'm building a word with alphas; then I'll bring all of them in at once. I also use custom shortcuts for actions I take all the time (flipping, rotating, manipulating layer styles, etc.). If you're more comfortable using PSE shortcuts, you might consider changing PS's default shortcuts to ones you're familiar with to make the transition easier (Edit>Keyboard Shortcuts).
Historically, PSCC has a setting where items brought onto your layout are brought in as Smart Objects. While Smart Objects have their place, if everything you bring in is a Smart Object, your layout file size will be huge. I would recommend changing this setting from the default by deselecting the checkbox (Edit>Preferences>General). If you need an item to be a Smart Object, you can always convert it by right-clicking on the layer and choosing that option.
If you ever need any help, just let me know.