Glad to see your back SD.
The initial grind is tough for f2p. Then you finally build your first good deck and your stuck with that one deck for ages. Eventually you make your second and third (helps if your second and third are spin-off decks that can reutilize cards you already have) and then things start to get better.
I was at the point were I had just finished my second deck and I got curious about P2win, if the difference was all that big. It is. I bought Gems, openned a sh1tload of packs, got a ton of WCs and suddenly, I have the freedom to build just about any deck I want. I'm blowing WCs on rare lands and am nowhere near running out.
So my current gaming experience has shifted completely after spending money. It's the exact opposing of when I was grinding f2p, so I guess that proves it, the game is completely p2w.
Also, gems have let me play more draft (which is also a great way to get more cards) which also breaks the monotony of the grind and is a change of pace from facing RDW and
control every other game.
Saving up all week to blow 5000 gold for a f2p player is really Harsh (I know because I did it and went 0-3 on my first run). But with gems, you can always recover some and keep playing until you run out.
My advice is, focus on 1 deck. Make sure that it's a deck you enjoy and that it can hold its own against the meta and slowly put it together until its complete. It helps if that deck has cards that can be used in a variety of other decks for when you feel like getting creative later. But it'll really have to be later, because at the current aquisition rate, it'll take a month or 2 to finish that first deck.
As to buying gems, I wouldn't encourages anyone to do so yet, but it can really change the whole gaming experience, for a Price...